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Wyświetlanie 1-15 z 18
Tytuł:
Determination of X-Ray Total Attenuation Coefficient in Zr, Ag, In for Energy Range Between 10.5-111.9 keV
Autorzy:
Turgut, Ü.
Büyükkasap, E.
Şimşek, Ö.
Ertuğrul, M.
Doğan, O.
Powiązania:
https://bibliotekanauki.pl/articles/1968894.pdf
Data publikacji:
1998-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.-t
Opis:
The total X-ray attenuation coefficients in elements Zr, Ag, and In for K$\text{}_{α}$ and K$\text{}_{β}$ characteristic lines of elements with different Z (33 ≤ Z ≤ 92) were estimated by measuring attenuation in transmission method. The intensity of K X-rays was monitored by a Ge(Li) detector with energy resolution 190 eV at 5.9 keV. The experimentally measured attenuation coefficients were found in good agreement with the theoretical values of attenuation coefficients calculated by Storm, Israel and Hubbell, Seltzer.
Źródło:
Acta Physica Polonica A; 1998, 93, 5-6; 693-700
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ultra-High Resolution Atomic and Molecular Spectroscopy at the Advanced Light Source
Autorzy:
Schlachter, F.
Bozek, J.
Powiązania:
https://bibliotekanauki.pl/articles/1963298.pdf
Data publikacji:
1997-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.-t
Opis:
Ultra-bright ultraviolet and soft X-ray beams produced at the Advanced Light Source are achieving world records in spectroscopic resolution. High-resolution spectroscopy in the 20 to 300 eV photon energy range has been applied to photoionization yield and photoemission measurements in atoms and molecules to reveal previously unseen resonance series in doubly-excited autoionizing states of helium, to analyze angular distributions in photoemission from doubly-excited states of helium and other rare gases, to reveal vibrational and ligand-field splitting of small molecules through photoionization, and, to examine photoemission from doubly- and triply-excited hollow lithium atomic states.
Źródło:
Acta Physica Polonica A; 1997, 91, 4; 623-629
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alloying Effect on K X-Ray Fluorescence Cross-Section in Cr$\text{}_{x}$Ni$\text{}_{1-x}$ and Cr$\text{}_{x}$Al$\text{}_{1-x}$ Alloys
Autorzy:
Büyükkasap, E.
Powiązania:
https://bibliotekanauki.pl/articles/1968903.pdf
Data publikacji:
1998-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.30.-r
32.80.-t
Opis:
Alloying effect on the K$\text{}_{α}$ and K$\text{}_{β}$ X-ray fluorescence cross-sections in Cr$\text{}_{x}$Ni$\text{}_{1-x}$ and Cr$\text{}_{x}$Al$\text{}_{1-x}$ alloys was studied. The samples were excited by gamma rays with energy 59.5 keV from a$\text{}^{241}$Am radioisotope source and K X-rays emitted by the samples were counted with a Si(Li) detector. We found that K$\text{}_{α}$ and K$\text{}_{β}$ X-ray fluorescence cross-sections are changed by alloying effect in Cr$\text{}_{x}$Ni$\text{}_{1-x}$ and Cr$\text{}_{x}$Al$\text{}_{1-x}$ alloys for different composition x. We compared our results with the theoretical values.
Źródło:
Acta Physica Polonica A; 1998, 93, 5-6; 701-705
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transition Rate Dependence on the Non-Zero Initial Momentum in the ADK-Theory
Autorzy:
Ristić, V. M.
Miladinović, T. T.
Radulović, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/2047850.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.-t
32.80.Fb
32.80.Rm
Opis:
Tunneling regime, introduced by Keldysh, in the interaction of strong lasers with atoms has been now accepted as the reliable method for describing processes when low frequency lasers are involved. Yet it was always assumed that the ionized electrons are leaving the atom with zero initial momentum. Because we are interested in how non-zero momentum influences the transition probability of tunnel ionization, we obtained the exact expression for the momentum. Here the estimation of the transition probability with nonzero momentum included was conducted. Potassium atoms in the laser field whose intensity varied from 10$\text{}^{13}$ W/cm$\text{}^{2}$ to 10$\text{}^{14}$ W/cm$\text{}^{2}$ were studied. It seems that all energy of laser field is used for tunneling ionization process at the beginning of laser pulse - ionization probability is large. After that, with further action of laser pulse, ionization probability decreases, probably because part of laser pulse energy is used for increasing momentum of ejected electrons, leaving smaller amounts of light quanta available for ionization of remaining electrons. If laser pulse lasts long enough, then the amounts of light quanta available for ionization become larger, resulting in increase in ionization probability, now with greater starting energy of ejected electrons.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 909-914
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculating Ionization Transition Rate for Circularly Polarized Fields, Including Non-Zero Initial Momentum
Autorzy:
Ristić, V.
Miladinović, T.
Radulović, M.
Powiązania:
https://bibliotekanauki.pl/articles/1791204.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.-t
32.80.Fb
32.80.Rm
Opis:
Potassium atoms in circularly polarized laser field whose intensity (I) varies from 2× $10^{12}$ W/$cm^2$ to 2.5× $10^{14}$ W/$cm^2$ were studied. In the case when there is zero initial momentum, transition rate (that depends only on I) exhibits standard behaviour: as I increases, so thus the rate, until it reaches its maximum value at 1.1× $10^{14}$ W/$cm^2$; after that, rate diminishes as I increases. In the case of non-zero initial momentum, transition rate (that now depends on I but additionally on initial momentum, too) exhibits following behaviour: dependence of the rate on I follows standard pattern, it rises with increase of I until it reaches its maximum, and then diminishes. But with increase of momentum, ionization rate gradually diminishes.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 504-506
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Ponderomotive Potential and NonZero Initial Momentum of Ejected Electron on Transition Rate in Multiphoton Ionization
Autorzy:
Miladinović, T.
Petrović, V.
Ristić, V.
Powiązania:
https://bibliotekanauki.pl/articles/1399265.pdf
Data publikacji:
2013-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.-t
32.80.Fb
32.80.Wr
Opis:
The multiphoton ionization of neutral atoms irradiated by photons is an interesting topic for experimental and also theoretical examination. We study the influence of ponderomotive potential and non-zero initial momentum of ejected electrons on transition rate, and also on the generalized cross-section in the case of a multiphoton ionization process. Also, we study how the transition rate depends on the number of absorbed photons.
Źródło:
Acta Physica Polonica A; 2013, 124, 4; 658-660
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Circularly Polarized Laser Fields, with Different Z, Including Non-Zero Initial Momentum
Autorzy:
Ristić, V.
Miladinović, T.
Stevanović, J.
Powiązania:
https://bibliotekanauki.pl/articles/1504530.pdf
Data publikacji:
2011-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.-t
32.80.Fb
32.80.Rm
Opis:
In this paper, by estimating the influence of different atom charge Z to the transition rate in tunnel ionization of atoms in strong laser fields we are devoloping further the observations from our earlier work. That is in the process of tunnel ionization including non-zero momentum into calculation of the transition rate gives result in lower transition rates for ejecting electrons from atoms by low-frequency laser fields, indicating that much of the photons are engaged in transferring energy to the free electron and thus unable to contribute to the effect of ionization. This is a conclusion that needs further experimental testing, which would clarify the mechanisms of tunnel ionization.
Źródło:
Acta Physica Polonica A; 2011, 119, 6; 761-763
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coherent Population Trapping in Open and Closed Systems
Autorzy:
Windholz, L.
Powiązania:
https://bibliotekanauki.pl/articles/2012936.pdf
Data publikacji:
2000-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.-t
42.50.-p
Opis:
In the present paper, an overview on work concerning coherent population trapping within the hyperfine manifold of the sodium D$\text{}_{1}$-line is given. Besides manifestation of coherent population trapping for different Λ-schemes, also phase dependent processes in closed contour systems (four-level double Λ-schemes) are discussed, including the case of phase dependent electromagnetically induced transparency.
Źródło:
Acta Physica Polonica A; 2000, 97, 2; 259-274
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vacancy Transfer Probabilities from K to L Shell for Low Atomic Number Elements at 5.96 keV
Autorzy:
Ertuğral, B.
Baltaş, H.
Çelik, A.
Kobya, Y.
Powiązania:
https://bibliotekanauki.pl/articles/1537681.pdf
Data publikacji:
2010-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.-t
33.20.Rm
Opis:
Vacancy transfer probabilities from K to L shell were measured using $I_{Kβ}//I_{Kα}$ intensity ratios for six elements in the atomic region 16 ≤ Z ≤ 22. The K X-rays from the targets excited by 5.96 keV (1.85 GBq $\text{}^{55}Fe$ filtered annular source) incident photon were obtained using a high resolution PGT model Si(Li) detector. Theoretical values were calculated using radiative and radiationless transition rates of these elements. The measured values of $η_{KL}$ were compared with the theoretical ones. Reasonable agreement was typically obtained between present and theoretical values.
Źródło:
Acta Physica Polonica A; 2010, 117, 6; 900-903
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Blackbody-Radiation-Induced Decay and Excitation οf Rydberg States in Sodium
Autorzy:
Ovsiannikov, V.
Glukhov, I.
Powiązania:
https://bibliotekanauki.pl/articles/1791216.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.-t
32.80.Ee
32.70.Cs
Opis:
Rates of the blackbody radiation-induced excitation and decay were calculated for the S-, P-, D-series of the Rydberg states in sodium atoms with the Fues model potential method. Comparisons between three branches of the state depopulation mechanism (spontaneous decays, blakbody radiation-induced and excitations) were carried out. Simple analytical formulas were proposed for ratios of the blackbody radiation-induced decay and excitation rates to the spontaneous decay rate.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 528-531
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantum Optics of a Bose-Einstein Condensate
Autorzy:
Lewenstein, M.
You, L.
Cooper, J.
Powiązania:
https://bibliotekanauki.pl/articles/1931512.pdf
Data publikacji:
1994-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.-t
32.70.Jz
42.50.Fx
Opis:
We present a review of recent experimental and theoretical attempts to realize and investigate Bose-Einstein condensation in systems of cooled alkali atoms. We discuss a second quantized theory that describes quantum optics of such systems. We study in detail: (a) the weak field scattering off the condensate; and (b), the probing of the condensate with short laser pulses.
Źródło:
Acta Physica Polonica A; 1994, 86, 1; 173-190
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
$K_{β}//K_{α}$ X-Ray Intensity Ratios for Co, Ni, Cu, and~Zn in Phthalocyanines Complexes
Autorzy:
Baltas, H.
Ertugral, B.
Kantar, C.
Sasmaz, S.
Yılmaz, E.
Cevik, U.
Powiązania:
https://bibliotekanauki.pl/articles/1504553.pdf
Data publikacji:
2011-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.30.Rj
32.80.-t
31.70.-f
Opis:
The $K_{β} // K_{α}$ X-ray intensity ratios of Co, Ni, Cu and Zn in metalophthalocyanines complexes have been studied. Co, Ni, Cu and Zn elements have been excited by using 59.5 keV photons emitted by 50 mCi $\text{}^{241}Am$ radioactive source. K X-rays emitted by samples have been counted by a Si(Li) detector with resolution 0.16 keV at 5.9 keV. We have found that $K_{β} // K_{α}$ X-ray intensity ratios of Co, Ni, Zn, and Cu complexes have changed depending on chemical structures of Co, Ni, Zn and Cu. The measured values have been compared with the theoretical predictions and experimental values of pure elements.
Źródło:
Acta Physica Polonica A; 2011, 119, 6; 764-768
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experiments with a Mesomaser
Autorzy:
Lange, W.
Walther, H.
Powiązania:
https://bibliotekanauki.pl/articles/1931372.pdf
Data publikacji:
1994-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.Hz
32.80.-t
32.70.Jz
Opis:
We investigated the dynamically modified interaction between Rydberg atoms and a single mode of a microwave cavity driven by a strong external field. With a monochromatic injected field we observed dynamic suppression of spontaneous emission, when the intracavity Rabi frequency exceeds the cavity linewidth. We discuss a theoretical model using non-Markovian decay rates, which is in excellent agreement with experiment. When a bichromatic driving field is used, enhanced decay reappears in narrow resonance zones as the detunings and injected intensities are varied. These results are interpreted in terms of cavity-modified transitions between the Floquet states of a two-level atom. Striking aspects of these transitions are their small linewidth and an asymmetry between emission and absorption.
Źródło:
Acta Physica Polonica A; 1994, 86, 1; 7-28
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Entanglement of a Gas of Atomic Spins
Autorzy:
Bigelow, N. P.
Powiązania:
https://bibliotekanauki.pl/articles/2030479.pdf
Data publikacji:
2002-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.75.-b
42.50.-p
32.80.-t
Opis:
In this paper we discuss our recent work on the creation of massively entangled states of millions to trillions of thermal atomic spins. We consider the particular entangled states that are also spin-squeezed states.
Źródło:
Acta Physica Polonica A; 2002, 101, 3; 449-457
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Free Electrons Generation in the Interaction of Intense Laser Pulses with Atomic Clusters
Autorzy:
Rusek, M.
Orłowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/2041831.pdf
Data publikacji:
2005-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.-t
36.40.Gk
52.50.Jm
Opis:
Interaction of argon clusters with intense laser pulses is studied theoretically. Free electrons energy distribution is studied. Differences between infrared and vacuum ultraviolet frequency regimes are pointed out. Clear physical interpretation of the obtained results is given.
Źródło:
Acta Physica Polonica A; 2005, 107, 3; 473-478
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 18

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