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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:
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

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