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

The high resolution absorption spectrum of methane in the 10 800–14 000 cm−1 region: literature review, new results and perspectives

“…Broadband high-resolution molecular spectra undistorted by the instrumental line shape can be recorded with a highly precise frequency scale provided by the frequency comb. 95,96 Optical frequency comb Fourier transform spectroscopy has been applied to the high accuracy absorption measurements of CH 4 transitions in the 1250–1380 cm −1 interval 97 while dual-comb spectroscopy was used in the region of the ν 3 band near 3.4 μm, 98 of the 2 v 3 band near 1.6 μm 99 and in the icosad region (6770–7570 cm −1 ) at high temperature. 100 In our region of interest where the methane absorption is weak, cavity-enhanced absorption is suitable to achieve a sufficient sensitivity.…”

Broadband gas absorption spectrometer based on spatial dispersion with sub-ms time resolution

“…Fourier transform spectroscopy (FTS) using broadband thermal sources or supercontinuum coherent lasers allows broadband spectrum acquisition with high resolution 8,9 , thus is frequently employed for multi-species matter characterization. However, the mechanical scanning of an optical delay arm for interferometry is time-consuming and apparently not suited to time-resolved settings.…”