Calculation of the relative abundance between He-like and Li-like Cr undercoronal conditions

Citation
Xd. Li et al., Calculation of the relative abundance between He-like and Li-like Cr undercoronal conditions, J PHYS B, 34(13), 2001, pp. 2537-2546
Citations number
25
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
ISSN journal
0953-4075 → ACNP
Volume
34
Issue
13
Year of publication
2001
Pages
2537 - 2546
Database
ISI
SICI code
0953-4075(20010714)34:13<2537:COTRAB>2.0.ZU;2-S
Abstract
The paper provides details of theoretical calculations of the relative abun dance between He-like and Li-like Cr in the electron temperature range from 0.1 to 20 keV under coronal conditions. The results show that the abundanc e of Li-like Cr is less than 10.4% when the election temperature exceeds 3 keV and this percentage will further decrease when photon ionization is tak en into account. Thus, it is proven that for the Cr plasma it is approximat ely true that there are only two charge states (H-like and He-like) in the plasma when the electron temperature is beyond 3 keV The results also show that the abundance of Li-like Cr will reach a maximum in the temperature ra nge from 0.8 to 0.9 keV. In this paper the Younger formula is used to estim ate the electron-ion collision rates and it is shown that this formula is i n good agreement with the experimental data and is better than other theore tical methods. Dielectronic recombination of He-like Cr is considered by a full-quantum-mechanics method and the total electronic recombination rates of He-like Cr will reach a maximum value at a temperature of 3.5 keV, which is near the plasma temperature 3 keV formed as in Shepard et al (1996 Phys . Rev. E 53 5291).