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The conformer was produced in cryogenic matrices (Ar, Kr, and N2) by in situ selective narrowband near-infrared excitation of the lower-energy cis-TBAA conformer and characterized both structurally and vibrationally. The novel trans-TBAA conformer is shown to spontaneously decay to the most stable cis-TBAA form in all studied matrix media, by tunneling, and the measured decay rates in the different matrices were compared with those of the trans conformers of other carboxylic acids in similar experimental conditions. In the N2 matrix, where trans-TBAA establishes a specific stabilizing intermolecular interaction with the host N2 molecules via its OH group and is about 11 times more stable than in rare gas matrices, the effect of changing the irradiation wavenumber within the 2\u03bdOH absorption profile was investigated in detail. An interesting phenomenon of matrix-site changing mediated by conformational conversion was observed in the N2 matrix: vibrational excitation of cis-TBAA in the 2\u03bdOH wavenumber range predominantly converts the molecules located in a specific \u201cmatrix site\u201d into trans-TBAA; then, relaxation (by tunneling) of the produced higher-energy conformer back to the cis form populates almost exclusively another \u201cmatrix site.\u201d The experimental studies received support from quantum chemistry calculations, which allowed a detailed characterization of the relevant regions of the potential energy surface of the molecule and the detailed assignment of the infrared spectra of the two conformers in the various matrices.<\/jats:p>","DOI":"10.1063\/1.5010288","type":"journal-article","created":{"date-parts":[[2018,1,23]],"date-time":"2018-01-23T18:16:28Z","timestamp":1516731388000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":13,"title":["Near-infrared <i>in situ<\/i> generation of the higher-energy <i>trans<\/i> conformer of tribromoacetic acid: Observation of a large-scale matrix-site changing mediated by conformational conversion"],"prefix":"10.1063","volume":"148","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1161-9098","authenticated-orcid":false,"given":"Rui F. 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