Einstein A coefficients and oscillator strengths for the A 2Π-X2Σ+ (red) and B 2Σ+-X2Σ+ (violet) systems and rovibrational transitions in the X2Σ+ state of CN

James S A Brooke, Ram S. Ram, Colin M. Western, Gang Li, David W. Schwenke, Peter F. Bernath

Research output: Contribution to journalArticle (Academic Journal)

52 Citations (Scopus)

Abstract

Line strengths have been calculated in the form of Einstein A coefficients and f-values for a large number of bands of the A 2Π-X 2Σ+ and B 2Σ+-X 2Σ+ systems and rovibrational transitions within the X 2Σ+ state of CN using Western's PGOPHER program. The J dependence of the transition dipole moment matrix elements (the Herman-Wallis effect) has been taken into account. Rydberg-Klein-Rees potential energy functions for the A 2Π, B 2Σ+ , and X 2Σ+ states were computed using spectroscopic constants from the A 2Π-X 2Σ+ and B 2Σ+-X 2Σ+ transitions. New electronic transition dipole moment functions for these systems and a dipole moment function for the X 2Σ+ state were generated from high level ab initio calculations and have been used in Le Roy's LEVEL program to produce transition dipole moment matrix elements (including their J dependence) for a large number of vibrational bands. The program PGOPHER was used to calculate Einstein A coefficients, and a line list was generated containing the observed and calculated wavenumbers, Einstein A coefficients and f-values for 290 bands of the A 2Π-X 2Σ + transition with v′ = 0-22, v″ = 0-15, 250 bands of the B 2Σ+-X 2Σ+ transition with v′ = 0-15, v″ = 0-15 and 120 bands of the rovibrational transitions within the X 2Σ+ state with v = 0-15. The Einstein A coefficients have been used to compute radiative lifetimes of several vibrational levels of the A 2Π and B 2Σ + states and the values compared with those available from previous experimental and theoretical studies.

Original languageEnglish
Article number23
Number of pages15
JournalAstrophysical Journal Supplement Series
Volume210
Issue number2
DOIs
Publication statusPublished - 1 Feb 2014

Keywords

  • astronomical databases: miscellaneous
  • methods: laboratory: molecular
  • molecular data
  • opacity
  • stars: abundances
  • techniques: spectroscopic

Fingerprint Dive into the research topics of 'Einstein A coefficients and oscillator strengths for the A <sup>2</sup>Π-X<sup>2</sup>Σ<sup>+</sup> (red) and B <sup>2</sup>Σ<sup>+</sup>-X<sup>2</sup>Σ<sup>+</sup> (violet) systems and rovibrational transitions in the X<sup>2</sup>Σ<sup>+</sup> state of CN'. Together they form a unique fingerprint.

  • Cite this