Abstract

Air-, nitrogen-, and oxygen-broadened halfwidth and pressure-induced line shift coefficients have been measured for over seventy-five individual vibration–rotation transitions in the ν3 fundamental band of 13CH4 at 3 μm from room temperature IR laboratory absorption spectra recorded at a 0.01-cm−1 resolution with a Fourier transform spectrometer. Transitions up to J″ = 13 in the P-branch and J″ = 7 in the R-branch were analyzed using a nonlinear least-squares curve fitting technique assuming a Voigt line shape. From the analysis, we have determined the mean ratios of air- to nitrogen-broadened and air- to oxygen-broadened halfwidth coefficients obtained for the same transitions as 1.00 ± 0.03 and 1.06 ± 0.04, respectively. The measured pressure shift coefficients were predominantly negative, and the mean and standard deviation values for air-, nitrogen-, and oxygen-broadened shifts were −0.0067 ± 0.0032, −0.0068 ± 0.0041, and −0.0066 ± 0.0028 cm−1 atm−1, respectively. Comparisons are made with the results obtained for similar transitions in the ν3 band of 12CH4 and the ν4 band of 13CH4.

© 1991 Optical Society of America

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Corrections

V. Malathy Devi, D. Chris Benner, Mary Ann H. Smith, and Curtis P. Rinsland, "Measurements of air-, N2-, and O2-broadened halfwidths and pressure-induced line shifts in the ν3 band of 13CH4: errata," Appl. Opt. 30, 2928-2928 (1991)
https://www.osapublishing.org/ao/abstract.cfm?uri=ao-30-21-2928

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