Atomic data for astrophysics: Ni xv

被引：9

作者：

Del Zanna, G. ^{[1
]}

Storey, P. J. ^{[2
]}

Mason, H. E. ^{[1
]}

机构：

[1] Ctr Math Sci, DAMTP, Cambridge CB3 0WA, England

[2] UCL, Dept Phys & Astron, London WC1E 6BT, England

来源：

ASTRONOMY & ASTROPHYSICS | 2014年 / 567卷

关键词：

atomic data; line: identification; techniques: spectroscopic; Sun: corona; ELECTRON-IMPACT EXCITATION; IRON PROJECT; RAY LINES; COLLISION STRENGTHS; EMISSION-LINES; FE XIII; TRANSITIONS; SPECTRA; REGION; NICKEL;

D O I：

10.1051/0004-6361/201423729

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the first R-matrix scattering calculation for electron collisional excitation of Ni xv. The large-scale target includes configurations up to n = 4. The calculations were carried out using the intermediate-coupling frame transformation method. Significant enhancements in the collision strengths, compared to previous distorted-wave (DW) calculations, are found for several cases, in particular the forbidden lines within the ground configuration and the 3s(2) 3p 4s levels. We provide a complete set of rates and a list of strongest lines that are observable in astrophysical plasmas. Previous identifications are reviewed, and a few new ones suggested. The new data can be used to accurately measure electron densities for high-temperature (3 MK) plasmas, and the nickel abundance.

引用

页数：7

共 35 条

[1] ROCKET SPECTROGRAM OF A SOLAR-FLARE IN THE 10-100 A REGION [J].