Line strengths and updated molecular constants for the C2 Swan system

TL;DR

This paper provides new rotational line strengths, updated molecular constants, and a comprehensive line list for the C2 Swan system, aiding astronomers and combustion scientists in spectral analysis.

Contribution

It introduces updated molecular constants and a detailed line list for the C2 Swan system based on recent observations and ab initio calculations.

Findings

New line strengths for vibrational bands v'=0-10 and v

A comprehensive line list including observed and calculated line positions, Einstein A coefficients, and oscillator strengths.

Updated molecular constants for the C2 Swan system based on combined observational and deperturbation data.

Abstract

New rotational line strengths for the C2 Swan system have been calculated for vibrational bands with v'=0-10 and v"=0-9, and J values up to J=34-96, based on previous observations in 30 vibrational bands. Line positions from several sources were combined with the results from recent deperturbation studies of the v'=4 and v'=6 states, and a weighted global least squares fit was performed. We report the updated molecular constants. The line strengths are based on a recent ab initio calculation of the transition dipole moment function. A line list has been made available, including observed and calculated line positions, Einstein A coefficients and oscillator strengths (f-values). The line list will be useful for astronomers and combustion scientists who utilize C2 Swan spectra. Einstein A coefficients and f-values were also calculated for the vibrational bands of the Swan system.