{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T14:47:18Z","timestamp":1785422838910,"version":"3.56.0"},"reference-count":49,"publisher":"Optica Publishing Group","issue":"4","license":[{"start":{"date-parts":[[2026,2,17]],"date-time":"2026-02-17T00:00:00Z","timestamp":1771286400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/doi.org\/10.1364\/OA_License_v2#VOR-OA"},{"start":{"date-parts":[[2026,2,17]],"date-time":"2026-02-17T00:00:00Z","timestamp":1771286400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/opg.optica.org\/policies\/opg-tdm-policy.json"}],"funder":[{"DOI":"10.13039\/100000001","name":"U.S. National Science Foundation","doi-asserted-by":"crossref","award":["AST-2307443"],"award-info":[{"award-number":["AST-2307443"]}],"id":[{"id":"10.13039\/100000001","id-type":"DOI","asserted-by":"crossref"},{"id":"https:\/\/ror.org\/021nxhr62","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":["opg.optica.org"],"crossmark-restriction":false},"short-container-title":["Opt. Express"],"published-print":{"date-parts":[[2026,2,23]]},"abstract":"<jats:p>\n                    We report the development of an 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 an 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 \u03bd\n                    <jats:sub>6<\/jats:sub>\n                    band of ethane and the \u03bd\n                    <jats:sub>10<\/jats:sub>\n                    band of the\n                    <jats:italic>gauche<\/jats:italic>\n                    conformer of ethanol near 7200 nm under both room temperature and cryogenic conditions.\n                  <\/jats:p>","DOI":"10.1364\/oe.585687","type":"journal-article","created":{"date-parts":[[2026,2,6]],"date-time":"2026-02-06T12:00:08Z","timestamp":1770379208000},"page":"6751","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Long-wave mid-infrared cavity-enhanced frequency comb spectroscopy of cold, complex molecules"],"prefix":"10.1364","volume":"34","author":[{"given":"Negar","family":"Baradaran","sequence":"first","affiliation":[{"name":"Princeton University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dominik","family":"Charczun","sequence":"additional","affiliation":[{"name":"Princeton University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tanay","family":"Nambiar","sequence":"additional","affiliation":[{"name":"Princeton University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Meijun","family":"Zou","sequence":"additional","affiliation":[{"name":"Princeton University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kevin F.","family":"Lee","sequence":"additional","affiliation":[{"name":"IMRA America Inc."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martin E.","family":"Fermann","sequence":"additional","affiliation":[{"name":"IMRA America Inc."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2551-9146","authenticated-orcid":true,"given":"Marissa L.","family":"Weichman","sequence":"additional","affiliation":[{"name":"Princeton University"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,2,17]]},"reference":[{"key":"oe-34-4-6751-R1","doi-asserted-by":"publisher","first-page":"1021","DOI":"10.1103\/RevModPhys.85.1021","type":"journal-article","volume":"85","author":"Tielens","year":"2013","journal-title":"Rev. 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