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.
引用
收藏
页数：7
相关论文
共 50 条
[21]   Electron-impact ionization of the 4p6 subshell in strontium [J].
Borovik, O. .
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 2022, 55 (24)
[22]   Generalized binary-encounter-Bethe model for electron impact ionization of atoms [J].
Wang, Yuan-Cheng ;
Jiao, Li Guang ;
Fritzsche, Stephan .
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 2024, 57 (04)
[23]   Autoionization cross section of potassium atom excited by electron impact [J].
Borovik, A. A. .
TECHNICAL PHYSICS, 2012, 57 (08) :1058-1061
[24]   IONIZATION BY ELECTRON-IMPACT [J].
MARK, TD .
PLASMA PHYSICS AND CONTROLLED FUSION, 1992, 34 (13) :2083-2090
[25]   Recommended electron-impact excitation and ionization cross sections for Be II [J].
Dipti ;
Bray, I. ;
Fursa, D. V. ;
Umer, H. ;
Hill, C. ;
Ralchenko, Yu. .
ATOMIC DATA AND NUCLEAR DATA TABLES, 2024, 156
[26]   Electron-impact excitation and ionization of atomic calcium at intermediate energies [J].
Zatsarinny, Oleg ;
Parker, Henry ;
Bartschat, Klaus .
PHYSICAL REVIEW A, 2019, 99 (01)
[27]   Recommended electron-impact excitation and ionization cross sections for Be I [J].
Dipti ;
Das, T. ;
Bartschat, K. ;
Bray, I. ;
Fursa, D. V. ;
Zatsarinny, O. ;
Ballance, C. ;
Chung, H. -K. ;
Ralchenko, Yu. .
ATOMIC DATA AND NUCLEAR DATA TABLES, 2019, 127 :1-21
[28]   Atomic Oxygen Escape on Mars Driven by Electron Impact Excitation and Ionization [J].
Zhang, Q. ;
Gu, H. ;
Cui, J. ;
Cheng, Y-M ;
He, Z-G ;
Zhong, J-H ;
He, F. ;
Wei, Y. .
ASTRONOMICAL JOURNAL, 2020, 159 (02)
[29]   Cross section for single ionization of magnesium by electron impact [J].
Jiao, L. ;
Zhou, Y. ;
Hou, P. .
PHYSICS LETTERS A, 2008, 372 (32) :5318-5320
[30]   Electron-impact single ionization of the nitrogen atom [J].
Jonauskas, Valdas .
ASTRONOMY & ASTROPHYSICS, 2022, 659
12345