Resonance excitation of autoionizing states in alkali atoms by electron impact
DOI:
https://doi.org/10.24144/2415-8038.2013.34.173-181Keywords:
Atom, Ion, Autoionization, Resonances, Ionization, Effective cross sectionAbstract
In the work, the main results on excitation and decay processes of autoionizing states in alkali atoms are considered. As follows from the data on excitation dynamics of subvalence shells in an impact energy region from the lowest excitation threshold up to 600 eV, at threshold energies their electron excitation results exclusively from the formation of negative-ion resonances. At mean impact energies, the cascade population processes due to resonance excitation and subsequent radiative decay of the upper states play an essential role for the low-lying autoionizing states. By comparing with theoretical data, the absolute excitation cross sections for autoionizing states and negative-ion resonances were determined. The absolute autoionization cross sections as well as the autoionization contribution to the total single ionization cross section were also determinedReferences
Pejcev V. et al. High-resolution ejected-electron spectrum of caesium vapour autoionising levels excited by 30 to 400 eV electrons. J. Phys. B. - 1977. - V.10, - №14. – C. 2935.
Hasted J.B. Electron Scattering Spectro-scopy. Contemp. Phys. - 1973. – V.14, - №4. – C. 357.
King G.C. in “Electron-molecule scat-tering and photoionization”. Edited by P.G. Burke and J.B. West (Plenum. Publishing Corporation), - 1988, - P. 99.
Боровик А.А. Разработка методики, аппаратуры и исследование электронных спектров автоионизационных состояний атомов при электронно-атомных столкновениях. Дисс. на соиск. уч. степ. канд. физ.-мат. наук. Ужгород, - 1981. - 176 c.
Алексахин И.С., Богачев Г.Г., Запесочный И.П., Угрин С.Ю. Экспериментальное исследование радиационного распада автоионизационных состояний щелочных и щелочно-земельных элементов. ЖЭТФ – 1981. - Т. 53. - С. 2187.
Zapesochny I.P., Aleksakhin I.S. Ionization of alakali metal atoms by slow electrons. - Sov. Phys.: JETP. – 1969. – V. 28. – P. 41.
Nygaard K.J. Electron impact autoionization of heavy alkali metals // Phys. Lett. A. – 1975. – V. 51. – P. 171.
Borovik A.A., Breza E.A., Zapesoch-ny I.P. Investigation of the excitation functions of potassium autoionising levels by monoenergetic electrons. Abstracts of Contributed Papers XVI ICPEAC, New-York, USA, 1989. - P. 875.
Боровик А.А, Бреза Э.А., Запесочный И.П. Возбуждение автоионизационных состояний калия и стронция моноэнергетическим электронным пучком. Тезисы докладов 4-го Всес. совещ. “Автоионизационные явления в атомах”, Москва, Россия, 1990, С. 18-21.
Borovik A.A., Grum-Grzhimailo A.N., Zatsarinny O.I. Excitation of potassium autoionising state 3p54s22P3/2 by elec-trons: experiment and theory. Abstracts of Contributed Papers XVIII ICPEAC, Aarhus, Denmark, 1993. - P.168.
Grum-Grzhimajlo A.N., Bartschat K. Excitation of the 3p54s22P autoionizing state in potassium by electron impact at low energies: an R-matrix calculation // J. Phys. B. - 2000. - V. 33. - P. 1843.
Borovik A.A. Measurements of excitation functions for non-radiatively decaying autoionizing states // Ukr. Phys. J. – 2000. – V. 45. – P. 1270.
Borovik A.A. et al. Electron impact excitation of the (3p54s2)2P3/2,1/2 autoionizing states in potassium // J. Phys. B. – 2005. – V. 38. – P. 1081.
Berezhko E.G., Kabachnik N.M. Theoretical study of inner-shell alignment of atoms in electron impact ionisation: angular distribution and polarisation of x-rays and Auger electrons // J. Phys. B. - 1977. – V. 10. – P. 2467.
Borovik A.A., Krasilinec V.N. Electron impact excitation functions of autoionizing states in lithium atomsn // J. Phys. B. – 1999. – V. 32. – P. 1941.
Borovik A., Zatsarinny O., Bartschat K. Near-threshold electron-impact excitation of the (3p54s2)2P3/2,1/2 autoionizing states in sodium // J. Phys. B. – 2008. – V. 41. – P. 035206.
Borovik A. et al. The 4p3p6 autoionization cross section of Rb atoms excited by low-energy electron impact // J. Phys. B. – 2012. – V. 45. – P. 045204.
Borovik A., Zatsarinny O., Bartschat K. Resonance effects in electron and photon impact excitation of the p6 subvalence subshell in alkali atoms // J. Phys. B. – 2009. – V. 42. – P. 044010.
Borovik A., Kupliauskiene A., Zatsarin-ny O. Excitation cross sections and spectroscopic classification of autoioni-zing levels in cesium atoms // J. Phys. B. – 2011. – V. 44. – P. 145203.
Kupliauskiene A. et al. The role of cascade processes in electron-impact excitation of the (3p54s2)2P3/2,1/2 autoionizing levels in potassium // J. Phys. B. – 2006. – V. 39. – P. 5912.
Lukomski M. et al. Electron-impact ionization cross section out of the ground and 6 2P excited states of cesium // Phys. Rev. A. - 2006. – V. 74. – P. 032708.
Mitnik D. et al. Excitation-autoionization through 3d-4l inner-shell excitation in Cu- to Kr-like ions and the effect on fractional-ion-abudance balance in coronal plasmas // Phys. Rev. A. - 1994. - V. 50. - P. 4911.
Боровик А.А. Сечение автоионизации атомов лития при возбуждении электронным ударом. Опт. Спектр. – 2010. – Т. 109. - № 3. – С. 355.
Боровик А.А. Сечение автоионизации атомов калия при возбуждении электронным ударом // ЖТФ. – 2012. – Т. 82. - вып. 8. – С. 18.
Borovik A., Roman V., Kupliauskiene A. The 4p6 autoionization cross section of Rb atoms excited by low-energy electron impact // J. Phys. B. – 2012. – V. 45. – P.045204.
Borovik A., Kupliauskiene A. The 5p6 autoionization cross section of cesium atoms: contribution to the single ionization by electron impact // J. Phys. B. – 2009. – V. 42. – P. 165202.
Kuchiev M.Yu., Sheinerman S.A. Resonant scattering with low-velocity outgoing charged particles // J. Phys. B. – 1988. – V. 21. – P. 2027.
Borovik A.A., Ogurtsov G.N. Excitation dynamics and post-collision interaction for lowest autoionizing states in Li and Li2 excited by electron impact // J. Phys. B. – 2010. – V. 43. – P. 165203.
Borovik A.A., Ogurtsov G.N. The post-collision energy shift of the (np5 (n+1)s2)2P3/2 lines in ejected-electron
spectra of sodium (n=2) and caesium (n=5) atoms excited by electron impact // J. Phys. B. – 2010. – V. 43. – P. 045204.
Borovik A.A., Ogurtsov G. N. Dynamics of post-collision interaction in the near-threshold electron excitation of the (3p54s2)2P3/2,1/2 autoionizing levels in potassium // J. Phys. B. – 2009. – V. 42. – P. 105202.
Borovik A., Roman V., Ogurtsov G.N. The post-collision interaction effect in autoionizing spectra of alkali atoms excited by electron impact // J. Phys. B. – 2013. – V. 446. – P. 055203.
Месси Г. Отрицательные ионы. М.: Мир, 1979. – 454 с.
Fano U. Spectral Distribution of Atomic Oscillator Strengths // Rev. Mod. Phys. – 1968. – V. 40. – P. 441.
Borovik A.A., Rojas H., King G.C., Remeta E.Yu. Electron-impact excitation of potassium autoionizing levels in the near-threshold region // J. Phys. B: At. Mol. Opt. Phys.– 1999.– V. 32. – P. 4225.
Hrytsko V., Roman V., Kupliauskiene A., Borovik A. The 4p6 electron energy-loss spectrum of Rb atoms. Proc. 28-th Int. Conf. on Physics of Photonic, Electronic and Atomic Collisions (ICPEAC), Lanzhou, China, 2013, ID: 17243
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