LASER PHOSPHORESCENCE EXCITATION SPECTRUM OF 2, 4, 5-TRIMETHYLBENZALDEHYDE IN THE PRESENCE OF AN ELECTRIC FIELD
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Date
1981
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Ohio State University
Abstract
The electric field effect on several of the bands in the phosphorescence excitation spectrum of 2, 4, 5-trimethylbenzaldehyde, isolated in a durene single crystal at 4.2$^{\circ} K$ , was measured. While the weak $T_{1}$ origin at 4139 {\AA} was narrow enough (ea. $1 cm^{-1}$) to resolve the stark splitting, the intense bands in the region previously assigned(1) to the second triplet state near 4060 {\AA} were broad (ca. $10 cm^{-1}$). A selective laser excitation technique was developed to overcome the problem of broad lines and determine the stark splitting of these bands. It was found that the most intense peak in the 4060 {\AA} region has the same $\Delta\mu$ vector, within the measurement uncertainties, as the $\tau_{1}$ origin. This is an unexpected result since the first triplet state is known to be $\pi\pi^{*}$ in character while the second is thought to be $n\pi^{*}$.
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(1) E. Migirdicyan, Chem. Phys. Letters, 12, 473, (1972)
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