Long-wave mid-infrared cavity-enhanced frequency comb spectroscopy of cold, complex molecules
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866911419224555520 |
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| author | Baradaran, Negar Charczun, Dominik Nambiar, Tanay Zou, Meijun Lee, Kevin F. Fermann, Martin E. Weichman, Marissa L. |
| author_facet | Baradaran, Negar Charczun, Dominik Nambiar, Tanay Zou, Meijun Lee, Kevin F. Fermann, Martin E. Weichman, Marissa L. |
| contents | 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 $ν_6$ band of ethane and the $ν_{10}$ band of the gauche conformer of ethanol near 7200 nm under both room temperature and cryogenic conditions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_04383 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Long-wave mid-infrared cavity-enhanced frequency comb spectroscopy of cold, complex molecules Baradaran, Negar Charczun, Dominik Nambiar, Tanay Zou, Meijun Lee, Kevin F. Fermann, Martin E. Weichman, Marissa L. Optics Chemical Physics 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 $ν_6$ band of ethane and the $ν_{10}$ band of the gauche conformer of ethanol near 7200 nm under both room temperature and cryogenic conditions. |
| title | Long-wave mid-infrared cavity-enhanced frequency comb spectroscopy of cold, complex molecules |
| topic | Optics Chemical Physics |
| url | https://arxiv.org/abs/2512.04383 |