dc.creator DiLella, Daniel P. en_US dc.creator Moskovits, M. en_US dc.date.accessioned 2007-08-31T14:09:15Z dc.date.available 2007-08-31T14:09:15Z dc.date.issued 1982 en_US dc.identifier 1982-MF-12 en_US dc.identifier.uri http://hdl.handle.net/1811/29074 dc.description $^{1}$ M. Moskovits and D.P. DiLella, J. Chem. Phys., 73, 6068 (1980). en_US dc.description.abstract In studies of surface-enhanced Raman scattering we have found evidence that the high field gradient near a silver surface may be responsible for the modification of the Raman selection rules for the $adsorbate.^{1}$ Quadrupale allowed electronic transitions for molecules near silver surfaces are now reported which are made observable by the high field gradient. The excitation spectra for fluorescence from a thin film of dye deposited on both a freshly evaporated silver mirror and an aluminum oxide substrate were measured between 300 and 550 nm. Both spectra had a peak corresponding to a transition form the $^{1}A_{g}$ ground state to a $^{1}B_{u}$ excited state but spectrum taken on the silver mirror had an additional peak. The additional peak corresponds to a transition form the $^{1}A_{g}$ ground state to an $^{1}A_{g}$ excited state. Variation of the source intensity showed that the peak did not result from a two photon effect and therefore must result from a quadrupole transition. The dyes studied were diphenyloctatetraene and diphenylhexatriene. en_US dc.format.extent 87821 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title QUADRUPOLE TRANSITIONS FOR MOLECULES NEAR SILVER SURFACES en_US dc.type article en_US
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