Abstract
We have recorded high-resolution absorption spectra of methane broadened by dry air and by N2 at temperatures from −63 to 41°C using a Fourier transform spectrometer. These spectra have been analyzed to determine pressure broadening and line-shift coefficients, along with their temperature dependences, for 148 lines in the ν4 fundamental band of 12CH4. The experimental uncertainties for lines with J″≤10 are generally <2% for the broadening coefficient b0L, 6–12% for its temperature dependence exponent n, 6–20% for the line-shift coefficient δ0, and 20–40% for its temperature dependence coefficient δ′; for J″> 10 the experimental uncertainties are somewhat larger. These results, especially for N2-broadening, are in excellent agreement with other recent measurements. Since the present results cover a wide range of rotational quantum numbers (J″ up to 14), the variation of the temperature dependence of the half-widths and shifts from line to line within the ν4 band is also examined.
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