Abstract
The ultrahigh-resolution mid-infrared absorption spectrum of methyl mercaptan (CH3SH) was recorded and analyzed in the region of 2945–2953cm-1, where the strong ν2-band is located. Benefitting from the high-resolution of tunable laser absorption spectrometry (TLAS) with a distributed feedback interband cascade laser (DFB-ICL), 12-strong and 27-weak air-broadened absorption peaks belonging to the ν2-band of CH3SH were assigned with resolution of better than 2.24×10-5cm-1(~26fm/670kHz) and absorption cross section precision of 2.0%, at temperature of 298.15K and pressure of 1atm. For further description of the assigned transitions, the spectral line parameters and cross sections of these absorption peaks versus pressure were investigated. These ultrahigh resolution air-broadened spectra can be used as reference data for CH3SH remote sensing and absolute spectral measurement applications.
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