Excitation-autoionization contribution to single ionization of Sr by electron impact

被引：1
|
作者：
Borovik, V [1 ]
Shafranyosh, I [1 ]
Borovik, O. [1 ,2 ]
机构：
[1] Uzhgorod Natl Univ, UA-88000 Uzhgorod, Ukraine
[2] Inst Electron Phys, UA-88017 Uzhgorod, Ukraine
来源：
PHYSICA SCRIPTA | 2020年 / 95卷 / 06期
关键词：
atom; single ionization; autoionization; cross-section; ALKALI-EARTH ATOMS; CROSS-SECTIONS; ABSORPTION-SPECTRUM; INNER-SHELL; STRONTIUM; STATES; CA; MULTIPLE; IONS; BA;
D O I：
10.1088/1402-4896/ab802d
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The 4p(6) excitation-autoionization (EA) cross-section of Sr atoms has been measured at electron-impact energies from the threshold to 600 eV. The cross-section has a pronounced resonance character in the near-threshold region, reaching its maximum value of (2.5 0.8) x 10(-16) cm(2) at 24.5 eV. The shape and absolute value of the cross-section are determined by the excitation dynamics and the decay mode of autoionizing states from 4p(5)4d5s(2), 4p(5)4d(2)nl and 4p(5)4d5snl configurations. A comparative analysis of the measured EA cross-section, the calculated 5s(2) ionization cross-section and the available ionization data showed that (i) direct ionization of the 5s(2) shell and EA of the 4p(6) shell adequately describe the single ionization of Sr atoms; (ii) 4p(6) EA contribution reaches 25% of the total single ionization cross-section of Sr atoms.
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页数：7
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