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Narrowband near-infrared excitation of the first overtone of the N\u2013H stretching vibration of each one of the two identified conformers is found to induce a selective large-scale conversion of the pumped conformer into the other one. This easily controllable bidirectional process consists in the intramolecular reorientation of the methoxy group and allowed a full assignment of the infrared spectra of the two conformers. Matrices with different conformational compositions prepared by narrow-band irradiations were subsequently used to investigate the effects of both thermal and broadband infrared excitations on the conformational mixtures. Particular attention is given to the influence of the matrix medium (Ar vs. Xe) and conformational effects of exposition of the sample to the spectrometer light source during the measurements.<\/jats:p>","DOI":"10.1063\/1.4944528","type":"journal-article","created":{"date-parts":[[2016,3,25]],"date-time":"2016-03-25T19:33:14Z","timestamp":1458934394000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":12,"title":["Conformational changes in matrix-isolated 6-methoxyindole: Effects of the thermal and infrared light excitations"],"prefix":"10.1063","volume":"144","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5953-976X","authenticated-orcid":false,"given":"A. 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