{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,27]],"date-time":"2026-04-27T20:27:00Z","timestamp":1777321620800,"version":"3.51.4"},"reference-count":38,"publisher":"AIP Publishing","issue":"14","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2010,10,14]]},"abstract":"<jats:p>Formic acid (HCOOH, FA) and acetic acid (CH3COOH, AA) are studied in a nitrogen matrix. The infrared (IR) spectra of cis and trans conformers of these carboxylic acids (and also of the HCOOD isotopologue of FA) are reported and analyzed. The higher-energy cis conformer of these molecules is produced by narrowband near-IR excitation of the more stable trans conformer, and the cis-to-trans tunneling decay is evaluated spectroscopically. The tunneling process in both molecules is found to be substantially slower in a nitrogen matrix than in rare-gas matrices, the cis-form decay constants being approximately 55 and 600 times smaller in a nitrogen matrix than in an argon matrix, for FA and AA respectively. The stabilization of the higher-energy cis conformer is discussed in terms of specific interactions with nitrogen molecule binding with the OH group of the carboxylic acid. This model is in agreement with the observed differences in the IR spectra in nitrogen and argon matrices, in particular, the relative frequencies of the \u03bdOH and \u03c4COH modes and the relative intensities of the \u03bdOH and \u03bdC\ue5fbO bands.<\/jats:p>","DOI":"10.1063\/1.3484943","type":"journal-article","created":{"date-parts":[[2010,10,12]],"date-time":"2010-10-12T23:26:59Z","timestamp":1286926019000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":90,"title":["Formic and acetic acids in a nitrogen matrix: Enhanced stability of the higher-energy conformer"],"prefix":"10.1063","volume":"133","author":[{"given":"Susy","family":"Lopes","sequence":"first","affiliation":[{"name":"University of Coimbra 1 Department of Chemistry, , Rua Larga, P-3004-535 Coimbra, Portugal"}]},{"given":"Alexandra V.","family":"Domanskaya","sequence":"additional","affiliation":[{"name":"University of Helsinki 2 Department of Chemistry, , P.O. Box 55, FIN-00014 Helsinki, Finland"}]},{"given":"Rui","family":"Fausto","sequence":"additional","affiliation":[{"name":"University of Coimbra 1 Department of Chemistry, , Rua Larga, P-3004-535 Coimbra, Portugal"}]},{"given":"Markku","family":"R\u00e4s\u00e4nen","sequence":"additional","affiliation":[{"name":"University of Helsinki 2 Department of Chemistry, , P.O. Box 55, FIN-00014 Helsinki, Finland"}]},{"given":"Leonid","family":"Khriachtchev","sequence":"additional","affiliation":[{"name":"University of Helsinki 2 Department of Chemistry, , P.O. Box 55, FIN-00014 Helsinki, Finland"}]}],"member":"317","published-online":{"date-parts":[[2010,10,12]]},"reference":[{"key":"2023070320171626800_c1","doi-asserted-by":"publisher","first-page":"L41","DOI":"10.1086\/180663","volume":"163","year":"1971","journal-title":"Astrophys. 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