Air-broadened halfwidths and pressure-induced line shifts in the nu(4) fundamental of (13)CH(4) 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 nu(4) bands of (12)CH(4) and (13)CH(4) have shown that (13)CH(4) air-broadened halfwidths are ~5% smaller than the corresponding (12)CH(4) halfwidths, and the pressure shifts for (13)CH(4) lines are ~5-15% larger than those for (12)CH(4).
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Devi et al. (1988) studied this question.
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