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Wyświetlanie 1-15 z 365
Tytuł:
Positron Scattering at Thermal Energies
Autorzy:
Fedus, K.
Karwasz, G.
Powiązania:
https://bibliotekanauki.pl/articles/1340032.pdf
Data publikacji:
2014-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.80.-i
34.80.Bm
34.80.Uv
Opis:
Modified effective range theory in analytical form is used to extrapolate elastic cross-sections down to thermal energies for positron scattering from five atomic and molecular targets including Ar, $H_2$, $N_2$, $C_6H_6$ (benzene) and $C_6H_{12}$ (c-hexane). The derived scattering parameters are then used to estimate the annihilation rates for chosen elements using a simple formula by Gribakin. We show that a combination of two simple models has a potential for accurate parameterization of coefficients describing the interaction of thermal positrons with non-polar targets of low polarizability such as Ar and $N_2$.
Źródło:
Acta Physica Polonica A; 2014, 125, 3; 829-832
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Angular Differential Cross-Sections for Electron Transfer in Collisions between Proton and He$\text{}^{+}$(1s) Ions
Autorzy:
Bhattacharyya, S.
Pathak, K.
Becker, A.
Faisal, F. H. M.
Powiązania:
https://bibliotekanauki.pl/articles/1952747.pdf
Data publikacji:
1996-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.70.+e
34.40.+n
Opis:
Angular differential cross-sections for the formation of H, as a result of electron capture by proton from He$\text{}^{+}$(1s) at the centre-of-mass energies from 4 to 24 keV, are calculated using distorted wave Coulomb-Born approximation. The total interaction potentials in the prior-interaction channel and in the post-interaction channel are considered. Coulomb boundary conditions are taken care of with the proper choice of the perturbation potentials in both the prior and the post channels. A prior-post discrepancy is noted. Existing theoretical results are presented along with the present results.
Źródło:
Acta Physica Polonica A; 1996, 90, 6; 1143-1153
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elastic Positron Scattering from Zinc and Cadmium in the Relativistic Polarized Orbital Approximation
Autorzy:
Szmytkowski, Radosław
Powiązania:
https://bibliotekanauki.pl/articles/1929814.pdf
Data publikacji:
1993-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.80.Bw
34.90.+q
Opis:
Results of relativistic calculations on the elastic positron scattering from zinc and cadmium atoms are presented in the low-energy region. The ab initio calculated polarization potentials applied in these calculations were obtained by solving the coupled Dirac-Hartree-Fock equations. It is shown that the indirect relativistic effects play an important role in the description of the scattering process. Particularly, relativity has a great influence on values of scattering lengths.
Źródło:
Acta Physica Polonica A; 1993, 84, 6; 1035-1040
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elastic Positron Scattering from Krypton and Xenon in the Relativistic Polarized Orbital Approximation
Autorzy:
Szmytkowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/1931546.pdf
Data publikacji:
1994-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.80.Bm
34.90.+q
Opis:
We present results of ab initio relativistic calculations on the elastic positron scattering from Kr and Ye atoms in the energy region below 10 eV. The approach employed was the relativistic polarized orbital approximation in which we tried to keep correctly orders of various contributions to positron-atom interaction potentials. In view of the serious disagreement between the present results and experimental data we conclude that the polarized orbital approximation even in its relativistic version is not able to provide reliable values of positron scattering cross-sections.
Źródło:
Acta Physica Polonica A; 1994, 86, 3; 309-314
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Maximum Limit of Rotational Energy Transfer in Molecular Collisions and the Hard Ellipsoid Potential Model
Autorzy:
Dabkara, N. K.
Powiązania:
https://bibliotekanauki.pl/articles/2027432.pdf
Data publikacji:
2001-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.50.Ez
34.50.-s
Opis:
The maximum limit of rotational energy transfer was investigated over a wide range of collision energy, reduced mass of the system, potential functions, and potential parameters for the N$\text{}_{2}$-Ne system. The classical limit of maximum rotational energy transfer, (ΔE)$\text{}_{max}$, was reviewed for a hard ellipsoid potential model. It was found that (ΔE)$\text{}_{max}$ predicted by the hard ellipsoid model is comparable to a well-known parameter |ΔE|* given by the power-gap law. The numerical equivalence of |ΔE|* with (ΔE)_max suggests that the value of ΔE)$\text{}_{max}$ given by hard ellipsoid potential model can be used as one parameter |ΔE|* of the power-gap law.
Źródło:
Acta Physica Polonica A; 2001, 100, 1; 41-51
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Production of Similar Fragments from the Glycine, Alanine, and Methionine Amino Acid Molecules under Low-Energy Electron Impact
Autorzy:
Romanova, L.
Tamuliene, J.
Vukstich, V.
Snegurskaya, T.
Papp, A.
Snegursky, A.
Powiązania:
https://bibliotekanauki.pl/articles/1402305.pdf
Data publikacji:
2015-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.50.Lf
34.90.+q
Opis:
Production of the ionic fragments of the same chemical composition due to a low-energy electron impact on the glycine, alanine, and methionine amino acid molecules has been studied both experimentally and theoretically. The mass-spectrometric technique was applied to detect the above ionic fragments within the 1-720 a.m.u. mass range with the ± 0.25 a.m.u. resolution, while the density functional theory based theoretical approach allowed the relevant species to be identified and the mechanisms of their production to be clarified. A special attention has been paid to analysis of the geometrical structures of the molecules under study as well to finding the appearance potentials of their fragments with the accuracy of ±0.1 eV.
Źródło:
Acta Physica Polonica A; 2015, 128, 1; 15-24
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stopping Power Calculations of Compounds by Using Thomas-Fermi-Dirac-Weizsäcker Density Functional
Autorzy:
Tufan, M.
Gűműş, H.
Powiązania:
https://bibliotekanauki.pl/articles/1812034.pdf
Data publikacji:
2008-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.50.Bw
34.10.+x
Opis:
Electronic stopping power of compounds was calculated by using the Thomas-Fermi-Dirac-Weizsäcker density functional. Bragg's rule was employed to determine stopping power of compounds from the elemental stopping power results. Calculations were done for Be, B, O, and Si ions in Al₂O₃, SiO₂, and CO₂ targets by using the Thomas-Fermi-Dirac-Weizsäcker density functional. The obtained results were compared with other Thomas-Fermi based theoretical calculations and show that using Thomas-Fermi-Dirac-Weizsäcker density functional in stopping power calculations yields reasonably accurate results in especially light systems (with respect to the number of electrons in the system).
Źródło:
Acta Physica Polonica A; 2008, 114, 4; 703-711
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scattering of Spin Polarized Positrons from Heavy Atoms: Europium and Bismuth
Autorzy:
Sharma, Kapil
Powiązania:
https://bibliotekanauki.pl/articles/1203962.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.80.Bm
34.80.Uv
Opis:
We present calculations of differential, integrated elastic, total momentum transfer cross-sections and spin polarization parameters S for scattering of positron from Eu and Bi atoms in the energy range 2.0 to 500.0 eV using relativistic approach. The target projectile interaction is represented both by real and complex parameter-free optical potentials in the solution of the Dirac equation for the scattered positrons. The theoretical results are obtained from relativistic approach based on solving the Dirac equation using Hartree-Fock and Dirac-Fock wave functions to calculate cross-sections at all the energies considered.
Źródło:
Acta Physica Polonica A; 2014, 126, 3; 688-693
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculations of Cross Sections Data for Scattering of Electrons on HBr
Autorzy:
Radmilović-Radjenović, M.
Petrović, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1537831.pdf
Data publikacji:
2010-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.50.-s
34.50.Gb
Opis:
The R-matrix method provides a complete theoretical framework for the treatment of low energy electron collisions. The method has been implemented into code Quantemol-N (EE) with a goal to provide users in plasma modeling, swarm studies and other applications with an option to calculate the missing data. In this paper we report on cross sections and rate coefficients for hydrogen bromide obtained by using Quantemol-N. The total cross section has been calculated both with and without Born corrections.
Źródło:
Acta Physica Polonica A; 2010, 117, 5; 745-747
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Observing Quantum Level Interference Effects with Electron Spectrometer
Autorzy:
Özer, Z.
Ulu, M.
Aktaş, B.
Doğan, M.
Powiązania:
https://bibliotekanauki.pl/articles/1399893.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.80.Dp
34.50.Gb
Opis:
The existence of Young-type interference patterns has been recently searched in triple differential cross-sections for single ionization of $H_2$ molecules by electron impact, and theoretically supported by calculations obtained by different models. The appearance of interference effects arising from the two-centre geometry of diatomic molecule. These effects seen in triple differential cross-sections are described by interference factor in analogy with light waves. In this work, we discuss about that the interference factor for molecular structure of $H_2$ may reproduce Young-type interference patterns depending on scattering angle, initial and ejected electron energies in triple differential cross-sections. Differences are expected in the triple differential cross-sections spectra of ejected electrons according to kinematical conditions imposed by scattering angle and electron energy.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 363-364
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rotational Energy Transfer in Molecular Collisions and Parameters of Power-Gap "Law"
Autorzy:
Agrawal, P. M.
Tilwankar, S.
Powiązania:
https://bibliotekanauki.pl/articles/1968836.pdf
Data publikacji:
1998-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.50.Ez
34.50.-s
Opis:
The quantum mechanical integral inelastic cross-sections for the rotation transitions in a diatomic molecule with an atom were computed and analysed by using the empirical power-gap "law" over a wide range of collision energy. A well-known parameter, |ΔE|$\text{}^{*}$, of the power-gap "law" was estimated by observing a rapid fall of cross-sections for the rotational energy transfer, |ΔE| ≥ |ΔE|$\text{}^{*}$. It was found that |ΔE|$\text{}^{*}$ corresponds to classical limit of maximum amount of rotational energy transfer permissible by the angular momentum conservation constraints and the hard ellipsoid potential model provided the hard ellipsoid potential surface is represented by the classical turning point surface of the real potential employed in the computation of cross-sections. Such an agreement is shown to be useful in the determination of the difference of major and minor axes of the intermolecular-potential ellipsoid from the knowledge of the cross-sections and the power-gap "law".
Źródło:
Acta Physica Polonica A; 1998, 93, 3; 451-458
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Collisions between Li(2P) Atoms and Electrons: Excitation of 4l Levels
Autorzy:
Pietruczuk, A.
Stacewicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/2035742.pdf
Data publikacji:
2003-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.80.-i
34.80.Dp
Opis:
Results of measurements of rate constants for transitions between 2P → 4S, 2 P → 4P, and 2P → 4D levels of lithium are presented. The investigations were performed in laser induced plasma. The results were compared with calculations based on Born and close coupling approach.
Źródło:
Acta Physica Polonica A; 2003, 103, 5; 423-432
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stopping Power Calculations for Partially Stripped Projectiles in High Energy Region
Autorzy:
Tufan, M. Ç.
Köroğlu, A.
Gümüş, H.
Powiązania:
https://bibliotekanauki.pl/articles/2041828.pdf
Data publikacji:
2005-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.50.Bw
34.10.+x
Opis:
The electronic stopping cross-section is calculated in the spirit of the Bethe theory. Interaction potential between projectile and target is regarded to have a Coulombic character and we have modified it to take into account velocity dependences on a number of bound electrons of projectile and an effective charge of projectile and target. These velocity dependences are obtained from the Bohr adiabatic criterion using the Thomas-Fermi atomic model. We have get the electronic stopping cross-section expression using the Bethe approximation; we obtained the stopping cross-section of C and Al for C, O, and Si ions from this expression and compared our results with experiment and other theoretical calculations.
Źródło:
Acta Physica Polonica A; 2005, 107, 3; 459-472
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antihydrogen Formation in Low Energy Collision of Positron with Antiproton
Autorzy:
Bhattacharyya, S.
Powiązania:
https://bibliotekanauki.pl/articles/1931542.pdf
Data publikacji:
1994-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.50.+a
34.70.+e
39.10.+x
Opis:
In the present paper two-body radiative recombination rate for the production of antihydrogen (H̅) in a merged beam of slow positrons (e$\text{}^{+}$) and antiprotons (p¯) is studied in the light of a two-step process, which consists of capture in an excited state of H̅ with subsequent decay to the ground state and emission of a photon. Computation is done using the field theory and the Coulomb gauge. Importance of the two-step radiative recombination process relative to the well-known spontaneous photorecombination process, on the two-body radiative recombination rate for antihydrogen formation, is discussed. The present result predicts higher contribution from the two-step radiative recombination process as compared to the spontaneous photorecombination process to the rate of cold antihydrogen formation with the relative collision energy below 0.01 Rydberg, near which experiments are being conducted. However, above 0.1 Rydberg the spontaneous photorecombination process dominates over the two-step radiative recombination process. The present result is valid, as well, for the formation of hydrogen atom due to collision between slow electron and proton.
Źródło:
Acta Physica Polonica A; 1994, 86, 3; 297-308
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurements of the Diffusion and Reflection Coefficients of Cd($\text{}^{1}S_{0}$) in Noble Gases
Autorzy:
Rudecki, P.
Domysławska, J.
Powiązania:
https://bibliotekanauki.pl/articles/2037041.pdf
Data publikacji:
2003-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.56.Lz
34.50.Dy
34.90.+q
Opis:
A new method of simultaneous determining of the diffusion coefficient and the reflection coefficient of atoms from the reservoir walls is presented. The diffusion coefficient of cadmium atoms in the ground state in buffer noble gas atoms such as Ne, Ar, Kr, and Xe and reflection coefficient of Cd atoms from the quartz cell wall in the temperature range 350-550 K were determined. Experimental values of diffusion coefficient are compared with theoretical ones calculated from available potentials.
Źródło:
Acta Physica Polonica A; 2003, 104, 6; 589-600
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 365

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