# NON-ADIABATIC VIBRONIC COUPLING IN 1,3,5,7-OCTATETRAENE

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 dc.creator Granville, M. F. en_US dc.creator Kohler, Bryan E. en_US dc.creator Schulten, K. en_US dc.date.accessioned 2006-06-15T14:29:51Z dc.date.available 2006-06-15T14:29:51Z dc.date.issued 1980 en_US dc.identifier 1980-FC-8 en_US dc.identifier.uri http://hdl.handle.net/1811/11167 dc.description $^{1}$M. F. Granville, G. R. Holtom, B. E. Kohler , R. L. Christensen, and K. L. D'Amico, J. Chem. Phys., 70, 593 (1979). $^{2}$T. Azumi and K . Matsuzaki, Photochem, Photobiol., 25, 315 (1977). en_US dc.description Author Institution: en_US dc.description.abstract trans, trans-1,3,5,7-Octatetrane in n-octane at 4.2K is an ideal polyene system in which the full implications of inversion symmetry are evident in the vibronically induced nature of the $1^{1}A_{g} - 2^{1}A_{g}$ electronic transition (1). With the aid of a high resolution two photon excitation spectrum, it is possible to quantitatively analyze the fluorescence and one photon absorption spectra in terms of the Duschinsky effect and adiabatic (Herzberg-Teller) and non-adiabatic (Born-Oppenheimer) vibronic coupling (2) between the $2^{1}A_{g}$ and $1^{1}B_{u}$ electronic states. Although the fluorescence spectrum can be explained by the usual Herzberg-Teller scheme, it is found that the one photon absorption is completely dominated by Born-Oppenheimer coupling. The form of this coupling is such that the relative signs of the normal mode displacements in the $2^{1}A_{g}$ and $1^{1}B_{u}$ states can be determined within a harmonic oscillator model. en_US dc.format.extent 124334 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title NON-ADIABATIC VIBRONIC COUPLING IN 1,3,5,7-OCTATETRAENE en_US dc.type article en_US