Ab initio calculations of Ca III Stark broadening parameters, transition probabilities and radiative lifetimes

作者：Alonso Medina A^*; Colon C

来源：Monthly Notices of the Royal Astronomical Society, 2013, 431(3): 2703-2715.

DOI：10.1093/mnras/stt356

• atomic data
• atomic processes

We have determined matrix elements for all experimental configurations of Ca III, including the 3s3p(6)3d configuration. These values have been obtained using intermediate coupling (IC). For these IC calculations, we have used the standard method of least-squares fitting from the experimental energy levels, using the computer code developed by Robert Cowan. In this paper, using these matrix elements, we report the calculated values of the Ca III Stark widths and shifts for 148 spectral lines, of 56 Ca III spectral line transition probabilities and of eight radiative lifetimes of Ca III levels. The Stark widths and shifts, calculated using the Griem semi-empirical approach, correspond to the spectral lines of Ca III and are presented for an electron density of 10(17) cm(-3) and temperatures T = 1.0-10.0 (x10(4) K). The theoretical trends of the Stark broadening parameter versus the temperature are presented for transitions that are of astrophysical interest. There is good agreement between our calculations, for transition probabilities and radiative lifetimes, and the experimental values presented in the literature. We have not been able to find any values for the Stark parameters in the references.

• 出版日期2013-5