Quantum Cascade Laser Dual-Comb Spectroscopy (Dcs) For Methane Gas Mixture Studies

For a long time FTIR and laser-based spectroscopies have been used for high resolution molecular spectroscopy studies. The recent development of Dual-Comb Spectroscopy at high resolution (<0.001 cm(-1)) makes this technique a powerful tool for gas phase studies. The IRis-F1 is a dual-comb spectrometer built on quantum cascade laser frequency combs. We show that it is very well adapted for measurements of line shape parameters. Despite its weak abundance, methane effect on climate and atmospheric chemistry is important. We measured with IRis-F1 the half-widths of absorption lines of methane diluted in nitrogen, and compared with results obtained by other spectroscopies.