Atomic data from the IRON project .23. Relativistic excitation rate coefficients for Fe XXII with inclusion of radiation damping

被引:28
作者
Zhang, HL
Pradhan, AK
机构
[1] Department of Astronomy, Ohio State University, Columbus
来源
ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES | 1997年 / 123卷 / 03期
关键词
atomic data; Sun; flares; X-rays; general;
D O I
10.1051/aas:1997352
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
New collision strengths have been calculated for 990 transitions among 45 fine structure n = 2 and n = 3 levels of Fe XXII. The relativistic Breit-Pauli formulation of the R-matrix method was employed in the close coupling approximation, with radiation damping of autoionizing resonances included for the first time in the calculations of excitation rate coefficients. It is found that, at low temperatures, the relativistic effects considerably enhance rate coefficients for the intercombination transitions, and the radiation damping effect reduces those for a few transitions. It is also found that resonances due to coupling with the n = 3 levels significantly enhance rate coefficients for the transitions to low-lying levels at intermediate and high temperatures, and for the transitions to the n = 2 high-lying levels at all temperatures. It is expected that the new data, tabulated at a wide range of temperatures, would lead to a revision of the spectral diagnostics of Fe XXII in laboratory and astrophysical sources, in particular the X-ray spectra observed from solar flares and tokamaks.
引用
收藏
页码:575 / 580
页数:6
相关论文
共 28 条
[1]  
Bautista MA, 1996, ASTRON ASTROPHYS SUP, V115, P551
[2]   Atomic data from the IRON project .20. Photoionization cross sections and oscillator strengths for Fe I [J].
Bautista, MA .
ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, 1997, 122 (01) :167-176
[3]   Atomic data from the Iron Project .16. Photoionization cross sections and oscillator strengths for Fe V [J].
Bautista, MA .
ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, 1996, 119 (01) :105-110
[4]   DIELECTRONIC RECOMBINATION .1. GENERAL-THEORY [J].
BELL, RH ;
SEATON, MJ .
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 1985, 18 (08) :1589-1629
[5]   RMATRX1 - BELFAST ATOMIC R-MATRIX CODES [J].
BERRINGTON, KA ;
EISSNER, WB ;
NORRINGTON, PH .
COMPUTER PHYSICS COMMUNICATIONS, 1995, 92 (2-3) :290-420
[6]  
BERRINGTON KA, 1995, ASTRON ASTROPHYS SUP, V109, P193
[7]  
Berrington KA, 1995, ASTRON ASTROPHYS SUP, V114, P367
[8]  
BUTLER K, 1994, ASTRON ASTROPHYS SUP, V108, P1
[9]   TECHNIQUES FOR CALCULATION OF ATOMIC STRUCTURES AND RADIATIVE DATA INCLUDING RELATIVISTIC CORRECTIONS [J].
EISSNER, W ;
JONES, M ;
NUSSBAUMER, H .
COMPUTER PHYSICS COMMUNICATIONS, 1974, 8 (04) :270-306
[10]  
GALAVIS ME, 1995, ASTRON ASTROPHYS SUP, V111, P347