Single- and double-electron capture processes in low-energy collisions of N{sup 3+} with He

Journal Article · Sat Oct 15 04:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.84.042706· OSTI ID:22095350

Liu, X. J. ^[1]; Wang, J. G. ^[2]; Qu, Y. Z. ^[3]; Buenker, R. J. ^[4]

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1. Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei 230031 (China)
2. Institute of Applied Physics and Computational Mathematics, P.O. Box 8009, Beijing 100088 (China)
3. College of Material Sciences and Optoelectronic Technology, Graduate University of the Chinese Academy of Sciences, P.O. Box 4588, Beijing 100049 (China)
4. Fachbereich C-Mathematik und Naturwissenschaften, Bergische Universitaet Wuppertal, D-42097 Wuppertal (Germany)

Single-electron capture (SEC) and double-electron capture (DEC) processes in collisions of ground state N{sup 3+} (2s{sup 2} {sup 1}S) ions with He are investigated by using the quantum-mechanical molecular-orbital close-coupling (QMOCC) method. The ab initio adiabatic potentials, radial and rotational coupling matrices utilized in QMOCC calculations, are obtained from the multireference single- and double-excitation configuration interaction approach. Total and state-selective SEC and DEC cross sections are presented in the low-energy range from 0.1 eV to 15 keV (i.e., 0.007 eV/u -1.07 keV/u) and rate coefficients in the temperature range from 10{sup 4} to 10{sup 7} K. Our results indicate that the SEC dominates the charge-transfer process in the considered energy region of this collision system and the SEC cross sections are nearly constant in the relatively high-collision energy region, while the DEC cross sections are about 2 orders of magnitude smaller. It is found that, for the SEC processes, in the dominant mechanisms, electrons are captured to exoergic channels N{sup 2+} (2s2p{sup 2} {sup 2}D,{sup 2}S), and for the DEC processes, they are captured to N{sup +} (2s{sup 2}2p{sup 2} {sup 1}D,{sup 1}S). Our calculations also reveal that rotational couplings become important at E > 10 eV/u for SEC and E > 200 eV/u for DEC processes.

• OSTI ID: 22095350
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 4 Vol. 84; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
COLLISIONS
CONFIGURATION INTERACTION
CROSS SECTIONS
ELECTRON CAPTURE
ELECTRONS
EV RANGE 01-10
EV RANGE 10-100
EXCITATION
GROUND STATES
HELIUM
MOLECULAR ORBITAL METHOD
NITROGEN IONS
QUANTUM MECHANICS
TEMPERATURE RANGE OVER 4000 K