Phase Interference in the Two-Photon Excitation of Phenanthrene

Authors: Koskelo, A. C.1; Curtin, D. L.2; Wirth, M. J.3

Source: Applied Spectroscopy, Volume 40, Issue 4, Pages 427-573 (May/June 1986) , pp. 486-489(4)

Publisher: Society for Applied Spectroscopy

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Abstract:

Two-photon polarization measurements are shown to provide an incorrect symmetry assignment for the first excited state of phenanthrene, both in solution and in the vapor phase. Published assignments from one-photon, single-crystal measurements indicate a totally symmetric state, while the assignment from two-photon measurements indicates an antisymmetric state. Possible reasons for the failure of the two-photon symmetry assignment are low-frequency vibronic overlap, and interference among the diagonal tensor elements. Experimental evidence points to interference as the origin of the discrepancy.

Keywords: Laser; Phenanthrene spectrum; Symmetry; Two-photon spectroscopy; Two-photon tensor

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702864508935

Affiliations: 1: Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706l; present address: The James Franck Institute, University of Chicago, Chicago, IL 60637 2: Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706 3: Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706; present address: L-310, Lawrence Livermore National Laboratory, Livermore, CA 94550

Publication date: May 1, 1986

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