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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

Research output: Contribution to journalArticle

  • James S A Brooke
  • Ram S. Ram
  • Colin M. Western
  • Gang Li
  • David W. Schwenke
  • Peter F. Bernath
Original languageEnglish
Article number23
Number of pages15
JournalAstrophysical Journal Supplement Series
Volume210
Journal issue2
DOIs
StatePublished - 1 Feb 2014

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.

    Research areas

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

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