Experimental and Theoretical Radiative Parameters of Highly Excited Levels in Re ii

• Published in: The Astrophysical journal. Supplement series Vol. 258; no. 2; pp. 35 - 39
• Main Authors: Liu, Meina, Ma, Huiting, Geng, Yidan, Palmeri, Patrick, Quinet, Pascal, Dai, Zhenwen
• Format: Journal Article Web Resource
• Language: English
• Published: Saskatoon The American Astronomical Society 01.02.2022; IOP Publishing
• Subjects: Atomic physics; Atomic spectroscopy; Laser induced fluorescence; Mathematical analysis; Oscillator strengths; Parameters; Physical, chemical, mathematical & earth Sciences; Physics; Physique; Physique, chimie, mathématiques & sciences de la terre; Radiative processes; Transition probabilities
• ISSN: 0067-0049; 1538-4365; 1538-4365
• DOI: 10.3847/1538-4365/ac4988

Abstract Natural radiative lifetimes of 22 odd-parity levels of Re ii in the energy range between 43,937.7 and 65,572.3 cm −1 were measured by the time-resolved laser-induced fluorescence method. To our knowledge, the lifetimes for 18 out of 22 levels were measured for the first time. The theoretical radiative lifetimes and branching fractions (BFs) for these levels were obtained from pseudorelativistic Hartree–Fock calculations including core-polarization effects. By combining the experimental lifetimes and calculated BFs, a set of semiempirical transition probabilities and oscillator strengths for 232 Re ii lines were determined. The radiative parameters obtained in the present work will greatly enrich the atomic database of Re ii and hence are expected to be helpful for astrophysicists in Re abundance evaluation of stars.