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Wyszukujesz frazę "CS" wg kryterium: Temat


Tytuł:
Radiative Lifetimes of Rydberg States in Neutral Gallium
Autorzy:
Yildiz, M.
Çelık, G.
Kiliç, H.
Powiązania:
https://bibliotekanauki.pl/articles/1808090.pdf
Data publikacji:
2009-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.70.Cs
Opis:
Radiative lifetimes were calculated using weakest bound electron potential model theory for $4s^{2}$ ns $\text{}^{2}S_{1//2}$ (n ≥ 7), $4s^{2}$ np $\text{}^{2}P^{0}_{1//2}$ (n ≥ 5), $4s^{2}$ np $\text{}^{2}P$ $\text{}^{0}_{3//2}$ (n ≥ 6), $4s^{2}$ nd $\text{}^{2}D_{3//2}^{0}$ (n ≥ 6), $4s^{2}$ nd $\text{}^{2}D$ $\text{}_{5//2}^{0}$ (n ≥ 6) series in neutral gallium. The use of the quantum defect theory and Martin's expressions allowed us to supply lifetime values along by means of the series above. The results obtained in this work presented good agreement with theoretical and experimental values. Moreover, some lifetime values not existing in the literature for highly excited Rydberg states in gallium atom were obtained using this method.
Źródło:
Acta Physica Polonica A; 2009, 115, 3; 641-646
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectral Intensities for the Emission |$\text{}^{4}$S$\text{}_{3}\text{}_{/}\text{}_{2}$ Γ$\text{}_{8}$〉 → |$\text{}^{4}$I$\text{}_{15}\text{}_{/}\text{}_{2}$ Γ〉in the Cs$\text{}_{2}$NaErCl$\text{}_{6}$
Autorzy:
Acevedo, R.
Soto-Bubert, A.
Navarro, G.
Meruane, T.
Stręk, W.
Powiązania:
https://bibliotekanauki.pl/articles/2037134.pdf
Data publikacji:
2004-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.70.Cs
Opis:
We report explicit vibronic intensity calculations for the |$\text{}^{4}$S$\text{}_{3}\text{}_{/}\text{}_{2}$ Γ$\text{}_{8}$> → |$\text{}^{4}$I$\text{}_{15}\text{}_{/}\text{}_{2}$ Γ>excitations in the Cs$\text{}_{2}$NaErCl$\text{}_{6}$ elpasolite-type systems, based upon new and updated experimental data, obtained from optical absorption measurements made at 10 K, in the energy range from 6,000 up to 26,000 cm$\text{}^{-1}$. Our calculation model is a generalization of the vibronic crystal field-ligand polarization method and the calculation is performed using a minimum set of adjustable parameters - all and each of them have a clear physical meaning. Our strategy was chosen so as to make a significant distinction with previous calculations, performed by other authors, who have worked out a model originated from a supra-parameterized scheme, within the framework of the superposition model of Newman. Throughout the course of the current work, it is shown that our model is suitable to handle this kind of calculations and also that the numerical results obtained are in fairly good agreement with experiment.
Źródło:
Acta Physica Polonica A; 2004, 105, 3; 233-251
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the relation between the dissolved 137cs activity and the simulated salinity in the lithuanian coastal waters
Autorzy:
Davuliene, L.
Valkünas, L.
Trinkünas, G.
Powiązania:
https://bibliotekanauki.pl/articles/972868.pdf
Data publikacji:
2001
Wydawca:
Instytut Morski w Gdańsku
Tematy:
Cs activity
salinity
Opis:
In May 2000 the hydrodynamic model developed at the Federal Maritime and Hydrographic Agency in Hamburg. Germany was adopted to the Lithuanian part of the Baltic Sea. I nm grid is chosen. Comparison of measurements (1999.05.15) with the real time simulations of the particular period showed that in general, in the modelled area. the simulated salinity was higher than measured with most differences in the coastal zone. Average salinity distributions and the distribution of salinity standard deviations were analysed. The coastal area of 15 nm from the seashore, especially to the north of the Klaipeda Strait, is distinguished by the highest variance of the salinity. The relation between the salinity and the dissolved 137 Cs activity concentration was observed. However, 137 Cs activity bursts 1.5-2 times higher at the coast than the average, cannot be explained and are more likely to be related to the uplifted particulate matter.
Źródło:
Biuletyn Instytutu Morskiego w Gdańsku; 2001, 28, 2; 49-54
1230-7424
2450-5536
Pojawia się w:
Biuletyn Instytutu Morskiego w Gdańsku
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the relation between the dissolved 137cs activity and the simulated salinity in the lithuanian coastal waters
Autorzy:
Davuliene, L.
Valkünas, L.
Trinkünas, G.
Powiązania:
https://bibliotekanauki.pl/articles/1920636.pdf
Data publikacji:
2001
Wydawca:
Instytut Morski w Gdańsku
Tematy:
Cs activity
salinity
Opis:
In May 2000 the hydrodynamic model developed at the Federal Maritime and Hydrographic Agency in Hamburg. Germany was adopted to the Lithuanian part of the Baltic Sea. I nm grid is chosen. Comparison of measurements (1999.05.15) with the real time simulations of the particular period showed that in general, in the modelled area. the simulated salinity was higher than measured with most differences in the coastal zone. Average salinity distributions and the distribution of salinity standard deviations were analysed. The coastal area of 15 nm from the seashore, especially to the north of the Klaipeda Strait, is distinguished by the highest variance of the salinity. The relation between the salinity and the dissolved 137 Cs activity concentration was observed. However, 137 Cs activity bursts 1.5-2 times higher at the coast than the average, cannot be explained and are more likely to be related to the uplifted particulate matter.
Źródło:
Biuletyn Instytutu Morskiego w Gdańsku; 2001, 28, 2; 49-54
1230-7424
2450-5536
Pojawia się w:
Biuletyn Instytutu Morskiego w Gdańsku
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New technologies for decontamination of radioactive substances scattered by nuclear accident
Nowe technologie dekontaminacji radioaktywnych substancji rozproszonych przez awarię nuklearną
Autorzy:
Nishizaki, Y.
Miyamae, H.
Ichikawa, S.
Izumiya, K.
Takano, T.
Kumagai, N.
Hashimoto, K.
Powiązania:
https://bibliotekanauki.pl/articles/351190.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
awaria nuklearna
rozproszone substancje radioaktywne
spalarnia odpadów
akumulacja Cs
odpady radioaktywne
adsorpcja cezu
nuclear accident
scattered Cs
waste incineration facility
Cs accumulation
Cs decontamination
radioactive waste
Opis:
Our effort for decontamination of radioactive cesium scattered widely by nuclear accident in March 2011 in Fukushima, Japan has been described. Radioactive cesium scattered widely in Japan has been accumulating in arc or plasma molten-solidified ash in waste incinerating facilities up to 90,000 Bq/kg of the radioactive waste. Water rinsing of the ash resulted in dissolution of cesium ions together with high concentrations of potassium and sodium ions. Although potassium inhibits the adsorption of cesium on zeolite, we succeeded to precipitate cesium by in-situ formation of ferric ferrocyanide and iron rust in the radioactive filtrate after rinsing of the radioactive ash with water. Because the regulation of no preservation of any kind of cyanide substances, cesium was separated from the precipitate consisting of cesium-captured ferric ferrocyanide and ferric hydroxide in diluted NaOH solution and subsequent filtration gave rise to the potassium-free radioactive filtrate. Cesium was captured by zeolite from the potassium-free radioactive filtrate. The amount of this final radioactive waste of zeolite was significantly lower than that of the arc-molten-solidified ash.
Opisano wysiłki podjęte po awarii nuklearnej w marcu 2011 w Fukushimie, Japonia. Radioaktywny cez rozproszony na znacznym obszarze Japonii jest akumulowany do poziomu 90,000 Bq/kg w spalarniach śmieci w procesie stapiania w łuku plazmy radioaktywnych śmieci. Przemywanie wodą popiołów powoduje wymywanie radioaktywnego cezu wraz ze znacznymi ilościami potasu i sodu. Ponieważ potas inhibituje adsorpcję cezu na zeolitach, udało się stracić cez w postaci kompleksu z żelazo żelazicyjankiem oraz tlenków żelaza w przesączu po przemywaniu radioaktywnego popiołu. Ustawodawstwo zakazuje przechowywania jakiejkolwiek substancji zawierającej grupę cyjanową, dlatego otrzymany osad rozpuszczono stosując rozcieńczony NaOH. Ponowna filtracja doprowadziła do uzyskania radioaktywnego przesączu nie zawierającego jonów potasu. Następnie radioaktywny cez został zaadsorbowany na zeolitach. Końcowa ilość radioaktywnych zeolitów była znacząco mniejsza od popiołów.
Źródło:
Archives of Metallurgy and Materials; 2013, 58, 1; 283-290
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sediment accumulation rates in the gotland deep, Baltic proper obtained by 210 Pb and 137 Cs Methods
Szybkość sedymentacji powierzchniowych osadów bałtyckich zmierzona przy użyciu 210 Pb i 137 Cs
Autorzy:
Szczepańska, A.
Zaborska, A.
Pempkowiak, J.
Powiązania:
https://bibliotekanauki.pl/articles/1819821.pdf
Data publikacji:
2009
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
sedymentacja
metoda 210 Pb o 137 Cs
sedimentation
Pb and 137 Cs methods
Opis:
Geochronology of sediments has important contribution to limnology and geochemistry including studies of accelerated eutrophication or regional erosion rates. It is also widely used to determine recent history of anthropogenic pollution and material balance [2]. Several different methods may be used to determine the ages of sediment layers. Historically, chronology has been based on qualitative methods such as stratigraphy, tectonics and morphology. However, the best results are obtained by means of radiometric dating, based on radioactive element activity e.g. radiocarbon, thorium, radiolead [11, 13].
Metoda ołowiowa jest powszechnie używana do oznaczania wieku osadów. Dodatkowo pozwala ona lepiej zrozumieć procesy geochemiczne zachodzące w osadach. W celu poprawy jakości wyników metodę ołowiową weryfikuję się używając 137 Cs. Poniższy artykuł dotyczy porównania szybkości sedymentacji osadów uzyskanych przy pomocy metody ołowiowej (model CRS- Constant Rate of Supply) z wynikami uzyskanymi za pomocą 137 Cs. Obliczenia wykonane zostały dla dwóch osadów pobranych z Głębi Gotlandzkiej. Wyznaczone metodą ołowiową wartości współczynników sedymentacji (0,7 mm/rok dla I stacji i 0,5 mm/rok dla II stacji) były niższe od współczynników sedymentacji obliczonych za pomocą 137 Cs (1,5 mm/rok dla I stacji i 1,7 mm/rok dla II stacji). Rozbieżność była spowodowana mieszaniem powierzchniowym osadów.
Źródło:
Rocznik Ochrona Środowiska; 2009, Tom 11; 77-85
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shape Errors, Internal Porosity, Linear Dimensions Accuracy and Allowances for the Machining of Castings Made in the Replicast CS Process
Autorzy:
Haratym, R.
Sieczka, M.
Biernacki, R.
Kwapisz, J.
Powiązania:
https://bibliotekanauki.pl/articles/382962.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Replicast CS process
shape errors
dimensional accuracy
proces Replicast CS
błędy kształtu
dokładność wymiarowa
Opis:
This research presents comprehensive assessment of the precision castings quality made in the Replicast CS process. The evaluation was made based on quality of the surface layer, shape errors and the accuracy of the linear dimensions. Studies were carried out on the modern equipment, among other things a Zeiss Calypso measuring machine and profilometer were used. Obtained results allowed comparing lost wax process models and Replicast CS process.
Źródło:
Archives of Foundry Engineering; 2014, 14, 3; 25-28
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
TUY 40 Telescope Control System Based on LabVIEW
Autorzy:
Dindar, M.
Dindar, S.
Kandemir, E.
Bayar, C.
Helhel, S.
Ozisik, T.
Powiązania:
https://bibliotekanauki.pl/articles/1402539.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
95.55.Cs
87.85.St
Opis:
Events and transients are becoming more and more crucial in modern astronomy such as supernovae, gamma-ray bursts and so on. VOEvent messages have all information to make the follow-up observations for transients and events which forces the scientists to make robotic observations. Robotic autonomous telescopes usually run under the control of a scheduler, which provides high-level control by selecting astronomical targets for observation. TUY 40 is a new robotic autonomous telescope control system designed by TÜBİTAK National Observatory (TUG). TUY 40 is based on 16 inch Meade LX-200 telescope mount and optical tube without any Meade electronic components and drive motors. The telescope control software developed on open-source Talon software and LabVIEW is presented. The algorithm for telescope control (slewing, tracking, homing etc.) was implemented in National Instruments PXI chassis written in LabVIEW real-time software from scratch. Talon is open-source software based on the GNU/C UNIX platform. A new TCP/IP library was implemented within Talon software to communicate with hard real-time telescope control software in LabVIEW PXI chassis. Initial setup without any permanent pier and polar alignment showed that the pointing error of the telescope has been obtained as 2.22 arcmin (132 arcsec) in RA axis (horizontal axis of the image) and 25 arcsec in Dec axis (vertical axis of the image), and tracking error has been observed as ≈ 4.8 arcsec per second.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-73-B-74
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sound Field Diffusivity Assessment in Non-Stationary State by Measuring Nonuniformity of Sound Decay Curve
Autorzy:
Leo, K.
Powiązania:
https://bibliotekanauki.pl/articles/1490368.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.55.Br
43.55.Cs
Opis:
Methods of sound diffusion assessment presented in literature require information on directional properties of the sound field in stationary state. These methods are complicated and not often applicable in measurement practice. Measurement of the sound field diffusivity during its formation can be assessed from sound level decay curve deviation from a linear shape. With this method, the degree of diffusivity has been determined in three rooms. Measurements were performed in rooms differing in volumes and sound absorption. Changes in sound decay uniformity were noted, which can be translated into diffusion coefficient changes. Results indicate that diffusion increases as room absorption decreases. Diffusion does not depend on room volume. Changes of sound decay uniformity follow trends that are well described by power function.
Źródło:
Acta Physica Polonica A; 2012, 121, 1A; A-197-A-200
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Expansion of the Rotational Energy of Diatomic Molecules into a Continued Fraction
Autorzy:
Molski, M.
Konarski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1920626.pdf
Data publikacji:
1992-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.10.Cs
33.10.Jz
Opis:
A new expansion of the rotational energy of diatomic molecules, in the form of a continued fraction has been investigated. The considered formula is applied in calculation of molecular constants and reproduction of rotational spectra of rigid-, semirigid- and van der Waals-type molecules. A physical interpretation of semiempirical expansion parameters is proposed and a connection between the method considered and the Dunham approach is also discussed.
Źródło:
Acta Physica Polonica A; 1992, 81, 4-5; 495-501
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Branching Ratio Measurements for Ge I and Ge II
Autorzy:
Bratasz, Ł.
Musioł, K.
Powiązania:
https://bibliotekanauki.pl/articles/2014238.pdf
Data publikacji:
2000-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.70.Fw
32.70.Cs
Opis:
A high resolution Fourier-transform spectrometer was used to measure branching ratios for 5s-5p, 4d-6s, 6s-6p, 5s-6p, 4d-6p, 4d-7p transitions in neutral germanium and 4d-4f, 4p$\text{}^{2}$-4f, 4p$\text{}^{2}$-5p, 5s-5p, 4p$\text{}^{2}$-4p, 4d-6p, 4p$\text{}^{2}$-6p, 4d-5f, 4p$\text{}^{2}$-5f, 4d-7p, 4p$\text{}^{2}$-7p of singly ionized germanium. Measurements were performed with a hollow cathode as a light source. Spectral lines intensities were measured in a spectral range from 200 to 3500 nm. Absolute transition probabilities for some Ge II lines were obtained using experimental lifetime values for the 4s$\text{}^{2}$4f$\text{}^{2}$F$\text{}_{5}\text{}_{/}\text{}_{2}$ ,$\text{}^{2}$F$\text{}_{7}\text{}_{/}\text{}_{2}$ and 4s$\text{}^{2}$5p$\text{}^{2}$P$\text{}_{1}\text{}_{/}\text{}_{2}$ ,$\text{}^{2}$P$\text{}_{3}\text{}_{/}\text{}_{2}$ levels. Our results for transitions in neutral germanium show that some infrared lines, so far overlooked in spectral analyses, give a strong contribution to Ge spectrum. Our transition probabilities obtained for Ge II lines are lower than all other experimental and theoretical results, in one case even by an order of magnitude.
Źródło:
Acta Physica Polonica A; 2000, 98, 4; 345-351
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ligand-Framework Coupling Vibrations. The ^2E_g → ^4A$\text{}_{2g}$ Transition in the Cr(CN)_6$\text{}^{3-}$ Complex Ion
Autorzy:
Acevedo, R.
Passman, M.
Navarro, G.
Powiązania:
https://bibliotekanauki.pl/articles/2024002.pdf
Data publikacji:
2001-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.70.Fw
32.70.Cs
Opis:
In this research paper we examine the role played by the bending vibrational modes of motion, δ(Cr-C-N) to influence the observed overall and relative vibronic intensity distribution for the $\text{}^{2}$E$\text{}_{g}$ → $\text{}^{4}A_{2g}$ phosphorescence of the Cr(CN)$\text{}_{6}^{3-}$ complex ion. The calculation was carried out assuming both: (a) a seven-atom system model (molecular approximation) and (b) a negligible distortion from the octahedral symmetry for the system. The ligand polarization formalism was employed with reference to this system, since the ligand subsystems (CN)$\text{}^{-1}$ are highly polarizable and as a consequence a conventional crystal field calculation would be both unrealistic and unappropriate. This system was chosen since there is a solid evidence to conclude that vibrations of the same type in the τ$\text{}_{1u}$ and τ$\text{}_{2u}$ symmetry blocks induce comparable intensity. This is a clear indication that both the τ$\text{}_{1u}$ and τ$\text{}_{2u}$: δ(Cr-C-N) bending vibrations are exceptionally efficient to promote this radiative transition. This dynamical model is tested against the experimental data and it is shown that the model calculation, though approximate, gives results in excellent agreement with experiment.
Źródło:
Acta Physica Polonica A; 2001, 99, 2; 215-231
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Regularities of Line Strengths in Spectra of NI, FI, and NeII
Autorzy:
Musielok, J.
Powiązania:
https://bibliotekanauki.pl/articles/1968961.pdf
Data publikacji:
1998-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.30.-r
32.70.Cs
Opis:
Recently experimentally determined individual (fine structure) line strengths for the spectra of NI, FI, and NeII are analysed, searching for regularities resulting from similarities in the structure of these species. Strengths of spectral lines of the prominent 3s-3p and 3p-3d transition arrays are investigated. The absolute scales of these experimentally derived data are based on independently determined lifetimes for excited levels of NI, FI, and NeII. The simple Coulomb approximation method was applied for calculations of the matrix elements for the "jumping" electron in order to obtain an average trend in line strengths of the studied emitters. In the case of the isoelectronic species (FI, NeII), additionally the trend resulting from the perturbation theory is taken for comparison. Except the trend study of the absolute scale, the strengths of individual lines within analogous multiplets (in a relative scale) are investigated and compared with data resulting from LS coupling scheme and with semi-empirical calculations.
Źródło:
Acta Physica Polonica A; 1998, 94, 1; 13-23
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies of Rotational-Vibrational Dynamics in Highly Excited HDO Molecule
Autorzy:
Pyka, J.
Powiązania:
https://bibliotekanauki.pl/articles/1887498.pdf
Data publikacji:
1991-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.10.Cs
33.10.Jz
Opis:
The dynamics of highly excited HDO molecule is investigated. Calculations up to J = 40 are performed for the bending-rotation Hamiltonian by applying the self-consistent (SC) methodology. Various aspects of rotation-vibration interaction are discussed. Centrifugal destabilization and stabilization of the molecular geometry is explained.
Źródło:
Acta Physica Polonica A; 1991, 79, 5; 635-653
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of High Power Laser Beam on Physical Properties of Epitaxial Films of Hg$\text{}_{1-x}$Cd$\text{}_{x}$Te (x≈0.2)
Autorzy:
Kuźma, M.
Abeynayake, C.
Sheregii, E.
Virt, I.
Powiązania:
https://bibliotekanauki.pl/articles/1891472.pdf
Data publikacji:
1991-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.60.Cs
81.40.Rs
Opis:
Models have been proposed explaining differences in electrophysical and photoelectrical properties of epitaxial films of Hg$\text{}_{1-x}$Cd$\text{}_{x}$Te (x≈0.2) before and after treating by single pulses of Nd:YAG laser. These models were obtained on the basis of the calculated distributions of temperature, temperature gradient and concentration of interstitial mercury during and after exposing to the laser pulse. These calculations were done using the net method.
Źródło:
Acta Physica Polonica A; 1991, 80, 3; 475-479
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectral Expansion of the Rovibrational Energy of Diatomic Molecules Described by Morse Potential
Autorzy:
Molski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1929815.pdf
Data publikacji:
1993-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.10.Cs
33.10.Jz
Opis:
On the basis of the deformable body model and the Morse potential approximation a six-parametric spectral expansion of the rovibrational energy of diatomic molecules, competitive to the standard Dunham approach, is proposed. The considered formula takes into account the centrifugal distortion effect and anharmonic corrections, which permit investigation of the molecular spectra over a wide range of rotational and vibrational states.
Źródło:
Acta Physica Polonica A; 1993, 84, 6; 1041-1048
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Core Polarization Effects in the Relativistic Quantum-Defect-Orbital Theory
Autorzy:
Bielińska-Wąż, D.
Martin, I.
Karwowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1931291.pdf
Data publikacji:
1994-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.70.Cs
32.90.+a
Opis:
The quantum-defect-orbital method has been reformulated in order to include both relativistic effects and the electron correlation described by a core polarization potential. All quantities appearing in this formulation may be evaluated analytically. A comparison with experimental results demonstrates, on one hand, significance of the relativity-correlation corrections and, on the other, inadequacy of the relativistic quantum-defect-orbital approach when indirect relativistic effects are important, i.e. when atoms contain closed shells of d electrons.
Źródło:
Acta Physica Polonica A; 1994, 85, 5; 805-812
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modified Kratzer-Fues Formula for Rotation-Vibration Energy of Diatomic Molecules
Autorzy:
Molski, M.
Konarski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1924270.pdf
Data publikacji:
1992-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.10.Cs
33.10.Jz
Opis:
An extension of the Kratzer-Fues approach to analytical calculation of the rotation-vibration energy of diatomic molecules is proposed. The eigen-values from this approach are applied in calculation of the rotational and rovibrational energies and in evaluation of molecular constants of selected diatomic molecules, resulting in satisfactory reproduction of experimental frequencies over a wide range of rotational states. In contrast to our previous proposition the rotational dependence of vibration energy is taken into account. An additional set of fitted parameters which include equilibrium distance and dissociation constant was also employed.
Źródło:
Acta Physica Polonica A; 1992, 82, 6; 927-936
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Centrifugal Distortion Effect in Diatomic Molecules Described by Morse Potential
Autorzy:
Molski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1929146.pdf
Data publikacji:
1993-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.10.Cs
33.10.Jz
Opis:
An attempt at including the centrifugal distortion effect in description of the rovibrational states of diatomic systems with a molecular potential approximated by the Morse function is presented. The derived Schrödinger equation can be rigorously solved leading to the eigenvalues in the form of a continued fraction, which are applied for evaluation of the molecular constants and for prediction of the rovibrational spectra of the selected diatomic molecules giving quite satisfactory reproduction of the experimental data. A simple extension of the method developed, by assuming the rotational dependence of the dissociation constant, is also proposed.
Źródło:
Acta Physica Polonica A; 1993, 83, 4; 417-423
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Emission Spectra for the Cs$\text{}_{2}$NaScCl$\text{}_{6}$:MoCl$\text{}_{6}^{3-}$ System in the Fm3m Space Group
Autorzy:
Acevedo, R.
Meruane, T.
Navarro, G.
Powiązania:
https://bibliotekanauki.pl/articles/2024014.pdf
Data publikacji:
2001-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.70.Fw
32.70.Cs
Opis:
On the basis of the data reported by Flint and Paulusz, we have undertaken a theoretical investigation of the intensity mechanism for the various emissions:Γ$\text{}_{8}$($\text{}^{2}$T$\text{}_{2g}$ ) → Γ$\text{}_{8}$($\text{}^{4}$A$\text{}_{2g}$), Γ$\text{}_{8}$($\text{}^{2}$E$\text{}_{g}$), Γ_8($\text{}^{2}$T$\text{}_{1g}$), Γ$\text{}_{6}$($\text{}^{2}$T$\text{}_{1g}$) for the Cs$\text{}_{2}$NaScCl$\text{}_{6}$:MoCl$\text{}_{6}^{3-}$ system in the Fm3m-space group. The experimental data available refer to the visible and near infrared luminescence spectra of MoCl$\text{}_{6}^{3-}$ complex ion in different hosts, such as Cs$\text{}_{2}$NaMCl$\text{}_{6}$ (M = Sc, Y, In), measured between 15,000 cm$\text{}^{-1}$ and 3,000 cm$\text{}^{-1}$ at liquid helium temperatures. At least, five luminescence transitions have been identified and assigned and each of them show extensive vibronic structure. A careful analysis of this experimental data shows that for the various observed electronic transitions, the vibrational frequencies change only slightly, and therefore there is no indication that the system undergoes both a significant and relevant Jahn-Teller distortion (along an active coordinate). There is however clear evidence that for the chloro-elpasolites, there is a strong resonance interaction between ν$\text{}_{3}$(τ$\text{}_{1u}$ : stretching) of the MoX$\text{}_{6}^{3-}$, complex ion and that of the host when M = In, Y. Thus for M = Sc, the slighter higher host ν$\text{}_{3}$, wave number is likely to minimize the effect of this coupling. This evidence will allow us for the Cs$\text{}_{2}$NaScCl$\text{}_{6}$:MoCl$\text{}_{6}^{3-}$ system to neglect, in the first-order approximation, the coupling among the internal and the external vibrations and to proceed using a both a molecular and the independent system models.
Źródło:
Acta Physica Polonica A; 2001, 99, 2; 233-242
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiative lifetimes for singly ionized beryllium
Autorzy:
Çelik, G.
Atalay, B.
Ateş, Ş.
Powiązania:
https://bibliotekanauki.pl/articles/1157856.pdf
Data publikacji:
2016-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.15.ag
32.70.Cs
Opis:
The theoretical lifetimes for singly ionized beryllium (Be II) have been calculated using the weakest bound electron potential model theory and the quantum defect orbital theory under the assumption of the LS coupling scheme. In the calculations, many states are considered. Some lifetime values for highly excited levels have been obtained using these methods. The lifetimes presented in this work have been compared with the early theoretical calculations and measurements presented in the literature. A good agreement with the results in the literature has been obtained.
Źródło:
Acta Physica Polonica A; 2016, 130, 3; 705-709
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diatomic Molecule as a Deformable Body
Autorzy:
Molski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1920623.pdf
Data publikacji:
1992-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.10.Cs
33.10.Jz
Opis:
On the basis of the deformable body model and harmonic potential approximation, a nonlinear Hamiltonian describing rovibrational states of diatomic molecules has been derived. The proposed approach is extended to include the Simons-Parr-Finlan potential, and the obtained equations are applied in evaluation of molecular constants and in reproduction of rovibrational spectra of the $\text{}^{1}$Σ state of $\text{}^{12}$C$\text{}^{32}$S, $\text{}^{13}$C$\text{}^{16}$O and rotational spectra of $\text{}^{12}$C$\text{}^{16}$O molecules. A comparison with the standard Dunham results is also made.
Źródło:
Acta Physica Polonica A; 1992, 81, 4-5; 485-494
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oscillator Strengths for Allowed Transitions in Li(II)
Autorzy:
Ateş, Ş.
Çelik, G.
Powiązania:
https://bibliotekanauki.pl/articles/1807774.pdf
Data publikacji:
2009-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.15.ag
32.70.Cs
Opis:
Electric dipole oscillator strengths have been computed for transitions between both multiplet and individual lines in the Li(II) ion. The weakest bound electron potential model theory has been used. We have employed both numerical Coulomb approximation wave functions and numerical non-relativistic Hartree-Fock wave functions in the determination of expectation values of radii. The necessary energy values have been taken from experimental ionization energies. The oscillator strengths calculated with parameters obtained by using the two different wave functions have been compared not only to each other but also to other data taken from literature. A good agreement with results in literature has been obtained.
Źródło:
Acta Physica Polonica A; 2009, 116, 2; 169-175
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Line Strength Data for the Spectra οf C(I), N(II), N(I) and O(II)
Autorzy:
Bacławski, A.
Musielok, J.
Powiązania:
https://bibliotekanauki.pl/articles/1807775.pdf
Data publikacji:
2009-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.70.Cs
32.70.Fw
Opis:
Recently determined experimental and theoretical data on line strengths within 3s-3p and 3p-3d multiplets for C(I), N(II), N(I) and O(II) are analyzed. An overall satisfactory agreement between experimental data and results of recent sophisticated calculations is found with exception of only some weaker transitions. However, the measured and calculated relative line strengths disagree significantly with data resulting from the LS coupling scheme, particularly for 3p-3d transitions. In numerous cases these differences are - to a considerable degree - "regular" along the isoelectronic sequences C(I)-N(II) and N(I)-O(II). For some multiplets these discrepancies also correlate with departures from the Landé interval rule for terms involved in the corresponding transitions.
Źródło:
Acta Physica Polonica A; 2009, 116, 2; 176-184
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fluctuation of radiocaesium concentrations in the near-surface atmospheric layer in Białystok in the period 1992-1999
Autorzy:
Kapała, J.
Zalewski, M.
Tomczak, M.
Mnich, Z.
Karpińska, M.
Powiązania:
https://bibliotekanauki.pl/articles/147161.pdf
Data publikacji:
2002
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
air contamination
Chernobyl accident
Cs-137
Opis:
Air samples were collected at an early-warning sampling and monitoring radioactive contamination station ASS-500. The results of the measurements are presented for radioactive aerosols collected on filters each week between 1992 and 1999. The large variations in activity concentration were observed in annual cycles. The maximum values exceeded the mean annual values by a factor of 2.8 to 7.3. Over the period of eight years the mean values of activity in air was found to decrease from 5.3 mi Bq m-3 in 1992 to 2.2 mi Bq m-3 in 1999. A good correlation between the Cs-137 activity and dust content in the air indicates that in the observed period the main source of Cs-137 activity is the dust with soil and vegetation particles. The effect of radiation from inhalation is negligible (626 pSv).
Źródło:
Nukleonika; 2002, 47, 2; 69-73
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł

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