title: New insights into the vibrational and optical signatures of trans-stilbene via integrated experimental and quantum mechanical approaches.
abstract: The structure, spectroscopic parameters and optical properties of stilbene have been investigated by a computational protocol including suitable treatment of anharmonic contributions together with new experimental results. A full reproduction of the 500-3500 cm(-1) IR spectrum has been possible using the VPT2 approach and new insights are provided in the 6000 cm(-1) region where typical signatures have been characterized as a set of overtones and combination bands. Vibrational contributions to electronic transitions have been taken into account to simulate the optical (absorption and emission) properties of stilbene. Spectra simulated by employing the state-of-the-art Adiabatic Hessian model coupled to global hybrid functionals are in remarkable agreement with their experimental counterparts and the inclusion of Herzberg-Teller contributions further improves the results with respect to those delivered by the basic Franck-Condon model.
authors.affiliation: Institut des Matériaux Jean Rouxel (IMN), Université de Nantes, CNRS, 2 rue de la Houssinière, BP 32229, 44322 Nantes cedex 3, France. florian.massuyeau@cnrs-imn.fr camille.latouche@cnrs-imn.fr.
authors.forename: Florian
authors.initials: F
authors.lastname: Massuyeau
authors.forename: Eric
authors.initials: E
authors.lastname: Faulques
authors.forename: Camille
authors.initials: C
authors.lastname: Latouche
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Barone