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Conformational changes in matrix-isolated 6-methoxyindole: Effects of the thermal and infrared light excitations Lopes Jesus, A. J. Reva, I. Araujo-Andrade, Cuauhtemoc Fausto, R. Universitat Politècnica de Catalunya. Institut de Ciències Fotòniques Àrees temàtiques de la UPC::Física Optics infrared light Òptica Conformational changes induced thermally or upon infrared excitation of matrix-isolated 6-methoxyindole were investigated. Narrowband near-infrared excitation of the first overtone of the N–H 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. Peer Reviewed Postprint (author's final draft) 2016-03-25 Article Lopes Jesus, A. J. [et al.]. Conformational changes in matrix-isolated 6-methoxyindole: Effects of the thermal and infrared light excitations. "THE JOURNAL OF CHEMICAL PHYSICS", 25 Març 2016, vol. 144, núm. 124306. 0021-9606 https://hdl.handle.net/2117/90917 eng http://scitation.aip.org/content/aip/journal/jcp/144/12/10.1063/1.4944528 007630/QUI/UI0313/2013 http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Open Access Attribution-NonCommercial-NoDerivs 3.0 Spain 9 p. application/pdf AIP