Theoretical transition probabilities, radiative lifetimes and Stark broadening parameters of singly ionized magnesium

Moreno Díaz, Cristina and Alonso Medina, Aurelia (2019). Theoretical transition probabilities, radiative lifetimes and Stark broadening parameters of singly ionized magnesium. "Monthly Notices of the Royal Astronomical Society", v. 490 (n. 2); pp. 1734-1737. ISSN 0035-8711. https://doi.org/10.1093/mnras/stz2744.

Description

Title: Theoretical transition probabilities, radiative lifetimes and Stark broadening parameters of singly ionized magnesium
Author/s:
  • Moreno Díaz, Cristina
  • Alonso Medina, Aurelia
Item Type: Article
Título de Revista/Publicación: Monthly Notices of the Royal Astronomical Society
Date: December 2019
ISSN: 0035-8711
Volume: 490
Subjects:
Freetext Keywords: Atomic data; Atomic processes
Faculty: E.T.S.I. Diseño Industrial (UPM)
Department: Ingeniería Eléctrica, Electrónica Automática y Física Aplicada
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The presence of spectral lines of singly ionized magnesium (Mg II) in stellar atmospheres has been reported in different stars. Recently, the low-resolution spectrum obtained from Supernova 2014 J in M82, in which Mg II absorption lines centred on 4400 Å as well as 7600 Å stand out, has been analysed. This is the motive for the atomic data calculations in this work, which are of much interest in the astrophysical area. In this article, ab initio relativistic Hartree–Fock calculations in an intermediate coupling formalism using Cowan’s code allowed us to obtain the required transition probabilities to calculate the theoretical radiative lifetimes for excited nS−, nP−, nD− and nF− states of singly ionized magnesium. An asymptotic dependence of lifetime (τ nl) on the effective principal quantum number (n∗) has been determined. Also, the Griem semi-empirical approach was used to obtain the theoretical Stark parameters (width and shift) of spectral lines; these data are displayed for an electron density of 10¹⁷ cm−3 and temperatures T=10–100(×10³ K). We have compared the results of lifetimes for 16 levels and Stark parameters for seven spectral lines with previously reported experiments available in the literature. Finally, we discuss the behaviour of the Stark parameters versus temperature for three relevant spectral lines (2802.70, 2797.99 and 7868.04 Å).

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainMAT-2015–63974-C4–2-RUnspecifiedUnspecifiedTratamiento mediante LSP de aleaciones de magnesio biodegradables y bioreabsorbibles como método de mejora de sus propiedades mecánicas

More information

Item ID: 57796
DC Identifier: http://oa.upm.es/57796/
OAI Identifier: oai:oa.upm.es:57796
DOI: 10.1093/mnras/stz2744
Official URL: https://academic.oup.com/mnras/article-abstract/490/2/1734/5589063?redirectedFrom=fulltext
Deposited by: Memoria Investigacion
Deposited on: 30 Jan 2020 07:56
Last Modified: 30 Jan 2020 07:56
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