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dc.contributor.authorWang, Huanen_US
dc.contributor.authorZhu, Chaoyuanen_US
dc.contributor.authorYu, Jian-Guoen_US
dc.contributor.authorLin, Sheng Hsienen_US
dc.date.accessioned2014-12-08T15:08:02Z-
dc.date.available2014-12-08T15:08:02Z-
dc.date.issued2009-12-31en_US
dc.identifier.issn1089-5639en_US
dc.identifier.urihttp://dx.doi.org/10.1021/jp903585cen_US
dc.identifier.urihttp://hdl.handle.net/11536/6302-
dc.description.abstractAnharmonic effects of the absorption and fluorescence spectra of pyridine molecule are studied and analyzed for the two-low lying singlet excited states S(1)((1)B(1)) and S(2)((1)B(2)). The complete active space self-consistent field (CASSCF) method is utilized to compute equilibrium geometries and all 27 vibrational normal-mode frequencies for the ground state and the two excited states. The present calculations show that the frequency differences between the ground and two excited states are small for the ten totally symmetric vibrational modes so that the displaced oscillator approximation can be used for spectrum Simulations. The Franck-Condon factors within harmonic approximation basically grasp the main features of molecular spectra, but simulated 0-0 transition energy position and spectrum band shapes are not satisfactorily good for S(1)((1)B(1)) absorption and fluorescence spectra in comparison with experiment observation. As the first-order anharmonic correction added to Franck-Condon factors, both spectrum positions and band shapes can be simultaneously improved for both absorption and fluorescence spectra. It is concluded that the present anharmonic correction produces a significant dynamic shifts for spectrum positions and improves spectrum band shapes as well. The detailed structures of absorption spectrum of S(2)((1)B(2)) state observed from experiment can be also reproduced with anharmonic Franck-Condon simulation, and these were not shown in the harmonic Franck-Condon simulation with either distorted or Duschinsky effects in the literature.en_US
dc.language.isoen_USen_US
dc.titleAnharmonic Franck-Condon Simulation of the Absorption and Fluorescence Spectra for the Low-Lying S(1) and S(2) Excited States of Pyridineen_US
dc.typeArticleen_US
dc.identifier.doi10.1021/jp903585cen_US
dc.identifier.journalJOURNAL OF PHYSICAL CHEMISTRY Aen_US
dc.citation.volume113en_US
dc.citation.issue52en_US
dc.citation.spage14407en_US
dc.citation.epage14414en_US
dc.contributor.department應用化學系分子科學碩博班zh_TW
dc.contributor.departmentInstitute of Molecular scienceen_US
Appears in Collections:Articles