Atomic data for astrophysics: Ni xv

作者：Del Zanna G^*; Storey P J; Mason H E

来源：Astronomy & Astrophysics, 2014, 567: A18.

DOI：10.1051/0004-6361/201423729

• atomic data
• line: identification
• techniques: spectroscopic
• Sun: corona

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.

• 出版日期2014-7