dc.creator Adam, A. G. en_US dc.creator Athanassenas, K. en_US dc.creator Kingston, C. T. en_US dc.creator Merer, A. J. en_US dc.creator Peers, J. R. D. en_US dc.creator Rixon, Scott J. en_US dc.creator Gillett, D. A. en_US dc.date.accessioned 2006-06-15T19:18:53Z dc.date.available 2006-06-15T19:18:53Z dc.date.issued 1999 en_US dc.identifier 1999-RI-13 en_US dc.identifier.uri http://hdl.handle.net/1811/19402 dc.description Author Institution: Department of Chemistry, University of New Brunswick; Department of Chemistry, University of British Columbia; Lambda-Physik, Inc., 3201 West Commercial Blvd. en_US dc.description.abstract Extensive new spectra have been taken for the visible systems of YOH and YOD, in an attempt to establish the vibrational assignments in the very confused $\bar{B}^{1}\Pi$ and $\widetilde{C}^{1}\Sigma^{+}$ states. It turns out that there is very strong vibronic coupling through the bending vibration between the $\widetilde{C}^{1}\Sigma^{+}$ state and the $A^{\prime}$ (lower) Born-Oppenheimer component of the $\tilde{B}^{1}\Pi$ state. The effect is that the bending frequency of the $\bar{C}^{1}\Sigma^{+}$ state is increased by 50\% relative to the ground state, while that of the $A^{\prime}$ component of the $\widetilde{B}^{1}\Pi$ state is reduced so far that the molecule becomes non-linear, with a potential barrier of about $120 cm^{-1}$ at the linear configuration; the $A^{\prime \prime}$ (upper) component of the $\widetilde{B}^{1}\Pi$ state is not affected. The principal evidence for the barrier is that the 010 $\Sigma^{+}$ vibronic level lies $1.4 cm^{-1}$ below the 000 level (linear molecule notation) in the $\widetilde{B}^{1}\Pi$ state of YOD. The density of the level structure in the $\widetilde{C}^{1}\Sigma^{+}$ state arises partly because higher levels of the $\widetilde{B}^{1}\Pi$ state lying among the levels of the $\widetilde{C}^{1}\Sigma^{+}$ state gain intensity through the vibronic coupling. en_US dc.format.extent 129549 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title STRONG VIBRONIC COUPLING IN THE VISIBLE SYSTEMS OF YOH AND YOD en_US dc.type article en_US
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