# $S_{1}, T_{1} {\leftarrow} S_{0}$ PHOSPHORESCENCE EXCITATION SPECTRUM OF BENZALDEHYDE

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 dc.creator Koyanagi, Motohiko en_US dc.creator Goodman, Lionel en_US dc.date.accessioned 2006-06-15T13:33:31Z dc.date.available 2006-06-15T13:33:31Z dc.date.issued 1972 en_US dc.identifier 1972-S-4 en_US dc.identifier.uri http://hdl.handle.net/1811/9107 dc.description Author Institution: School of Chemistry, Rutgers University en_US dc.description.abstract The $S_{1}, T_{1} {\leftarrow} S_{0}$ phosphorescence excitation spectrum for benzaldehyde was observed in several environments at $4.2^{\circ} K$ and nearly complete vibronic analyses were made. The $^{1}n, {\Pi}^{*}$ state couples strongly with several ring out-of-plane modes such as ${\nu_{11}}, {\nu_{17b}}, {\nu_{10a}},{\cdots}$ The absence of any two or more quanta of non-totally symmetric modes and any combination bands among them support a planar CHO-group --- benzene ring geometry. On the other hand, $T_{1} {\leftarrow} S_{0}$ and $T_{1} \rightarrow S_{0}^{1}$ behave differently showing strong dependences upon the environment. The vibronic interactions between close lying $^{3}{\Pi}, {\Pi^{*}}$ and $^{3}{\Pi},{\Pi^{*}}$ states can be discussed in terms of the energy gap showing the importance of the dynamical pseudo Jahn-Teller problem in the T --- S spectrum of benzaldehyde. This research was supported by National Science Foundation Grant GP 6301X. $^{1}$ M. Koyanagi and L. Goodman, J. Chem. Phys., 55, 2959 (1971). en_US dc.format.extent 121853 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title $S_{1}, T_{1} {\leftarrow} S_{0}$ PHOSPHORESCENCE EXCITATION SPECTRUM OF BENZALDEHYDE en_US dc.type article en_US