VIBRONIC PROGRESSIONS IN THE BENZALDEHYDE $^{1}U(n,\pi^{\ast}) \leftarrow^{1}A$ (3500{\AA}) BAND.
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Date
1965
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Ohio State University
Abstract
The polarized excitation spectrum of the $C_{\ast}$ molecule benzaldehyde in rigid hydrocarbon media was studied with reference to the polarized 0-0 band of the phosphorescence. Previous $work^{1}$ indicated the apparent presence of at least two vibrational progressions of opposite polarization. The present study at higher resolution, using a Baird-Atomic SF-1 Fluorispec shows that the most intense sequence is a totally symmetric progression polarized perpendicular to the molecular plane, with the weaker progression polarized predominantly along the carbonyl-ring axis. Comparison with $benzaldehyde-d_{1}$ and with the vapor $spectrum^{2}$ allows a vibrational analysis and makes possible an assessment of the allowed vs vibronic sources of intensity.
Description
Supported by the National Science Foundation. $^{1}$ R. Shimada and L. Goodman, This Symposium, 1964; R. Shimada and L. Goodman, J. Chem. Phys., in press. $^{2}$ F. Almasy, J. Chim. Phys. 30, 634 (1933).
Author Institution: Whitmore Chemical Laboratory, The Pennsylvania State University
Author Institution: Whitmore Chemical Laboratory, The Pennsylvania State University