Measurements of linestrengths, N2-, Ar-, He- and self-broadening coefficients of acetylene in the ν4+ν5 combination band using a cw quantum cascade laser

M.B. Sajid, E. Essebbar, A. Farooq
Journal of Quantitative Spectroscopy and Radiative Transfer, 148, pp. 1-12, (2014)

Measurements of linestrengths, N2-, Ar-, He- and self-broadening coefficients of acetylene in the ν4+ν5 combination band using a cw quantum cascade laser

Keywords

Acetylene, Linestrength, Collisional broadening, Infrared spectroscopy, Quantum cascade lasers

Abstract

​Linestrengths, N2-, Ar-, He- and self-broadening coefficients of acetylene have been measured at 296 K in the P branch of the ν45 combination band for 25 rotational transitions. The effect of gas temperature is studied over 296–683 K for five transitions to allow the determination of the temperature dependent exponent n for N2- and Ar-broadening coefficients. These measurements were performed using a continuous-wave quantum cascade laser (cw-QCL) operating over 1253–1310 cm−1. Spectroscopic parameters were obtained by fitting absorption spectra using Voigt, Galatry and Rautian profiles. Linestrength and broadening results are compared with previous studies available in literature for the ν45 combination band and other vibrational bands of acetylene.

Code

DOI:10.1016/j.jqsrt.2014.06.014

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