Lifetime calculations in energy levels of Kr vii

M Raineri,J O Souza,E Amorim,E E Farías,J Reyna Almandos

doi:10.1088/2399-6528/aa9903

Abstract

Calculations of the lifetimes for all experimentally known energy levels of the spectrum of the six times-ionized krypton (Kr vii) are presented. The relativistic Hartree–Fock method including core-polarization effects were used. The energy matrix was calculated using energy parameters adjusted to the experimental energy levels. We also present a calculation based on a relativistic multiconfigurational Dirac–Fock approach. For some energy levels, a comparison of these results with the bibliography data was made.

Highlights

Six times ionized krypton (Kr VII) belongs to the Zn I isoelectronic sequence
The analysis of the atomic structure of this ion is important in astrophysical plasma research and recently Kr VI and Kr VII lines have been observed in the ultraviolet spectrum of the hot DO-type white dwarf RE 0503-289 [1], in the first detection of krypton in this kind of star
Four different calculations of lifetimes in Kr VII were carried out: A, considering the HF approximation with relativistic corrections (HFR) approach [14] with the modifications very recently suggested by Kramida [12]; B and C, including core polarization effects (CP) effects HFR + CP [16] and D, using the general relativistic atomic structure package (GRASP) code [17]

Summary

22 December 2017

Any further distribution of polarization effects were used. The energy matrix was calculated using energy parameters adjusted to this work must maintain attribution to the the experimental energy levels. We present a calculation based on a relativistic multiconfiguraauthor(s) and the title of the work, journal citation tional Dirac–Fock approach. A comparison of these results with the and DOI

Introduction

Theory

Results and discussions

Conclusion