Long-wave mid-infrared cavity-enhanced frequency comb spectroscopy of cold, complex molecules

Abstract

We report the development of a new instrument for cavity-enhanced absorption spectroscopy of the fundamental rovibrational transitions of molecules in the long-wave mid-infrared (LWIR) region from 6500 to 10000 nm. Our setup combines a LWIR frequency comb, a high-finesse optical enhancement cavity, a cryogenic buffer gas cooling cell, and a Fourier transform interferometer to obtain broadband, high-resolution, and high-sensitivity molecular absorption spectra. Here, we showcase the capabilities of this setup by presenting the gas-phase LWIR spectra of the ${\nu }_6$ band of ethane and the ${\nu }_{10}$ band of the gauche conformer of ethanol near 7200 nm under both room temperature and cryogenic conditions.

References in corpus (2)

• Mid-Infrared Frequency Comb Fourier Transform Spectrometer
• Calculated line lists for H${}_{\text{2}}{}^{\text{16}}$O and H${}_{\text{2}}{}^{\text{18}}$O with extensive comparisons to theoretical and experimental sources including the HITRAN2016 database