Abstract

Air-broadened halfwidths and pressure-induced line shifts in the ν4 fundamental of 13CH4 were determined from spectra recorded at room temperature and at 0.01-cm−1 resolution using a Fourier transform spectrometer. Halfwidths and pressure shifts were determined for over 180 transitions belonging to J″ values of ⩽16. Comparisons of air-broadened halfwidths and pressure-induced line shifts made for identical transitions in the ν4 bands of 12CH4 and 13CH4 have shown that 13CH4 air-broadened halfwidths are ~5% smaller than the corresponding 12CH4 halfwidths, and the pressure shifts for 13CH4 lines are ~5–15% larger than those for 12CH4.

© 1988 Optical Society of America

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