A methane line list with sub-MHz accuracy in the 1250 to 1380 cm -1 range from optical frequency comb Fourier transform spectroscopy

We use a Fourier transform spectrometer based on a difference frequency generation optical frequency comb to measure high-resolution, low-pressure, room-temperature spectra of methane in the 1250 - 1380-cm -1 range. From these spectra, we retrieve line positions and intensities of 678 lines of two isotopologues: 157 lines from the 12 CH 4 v4 fundamental band, 131 lines from the 13 CH 4 v4 fundamental band, as well as 390 lines from two 12 CH 4 hot bands, v2 + v4 - v2 and 2 v4 - v4 . For another 165 lines from the 12 CH 4 v4 fundamental band we retrieve line positions only. The uncertainties of the line positions range from 0.19 to 2.3 MHz, and their median value is reduced by a factor of 18 and 59 compared to the previously available data for the 12 CH 4 fundamental and hot bands, respectively, obtained from conventional FTIR absorption measurements. The new line positions are included in the global models of the spectrum of both methane isotopologues, and the fit residuals are reduced by a factor of 8 compared to previous absorption data, and 20 compared to emission data. The experimental line intensities have relative uncertainties in the range of 1.5 - 7.7%, similar to those in the previously available data; 235 new 12 CH 4 line intensities are included in the global model.

Automated summary

In this study, a Fourier transform spectrometer was used to measure high-resolution spectra of methane under low-pressure and room-temperature conditions. The obtained line positions and intensities provide valuable data for studying the spectrum of methane isotopologues.