Line positions and intensities of acetylene in the 2.2-μm region

Abstract

More than 440 line positions and intensities of 8 bands of acetylene are measured in the 2.2-μm spectral region. A multispectrum fitting procedure has been applied to retrieve line parameters. The average absolute accuracy of the line parameters obtained in this work is estimated to be ±0.0005 cm −1 for the line positions, and ±5% for the line intensities. Vibrational transition dipole moment and Herman–Wallis coefficients are determined for two of the studied bands. An unusual rotational dependence of the vibrational–rotational transition dipole moment of remaining bands has been found. All measured line intensities are treated simultaneously within the framework of the effective operators approach. The sets of effective dipole moment parameters obtained reproduce the observed line intensities within the experimental uncertainty.