Piezomodulation spectroscopy of molecular crystals. III. The first singlet system of anthracene

Authors

J. Merski, University of Nebraska - Lincoln
Craig J. Eckhardt, University of Nebraska - LincolnFollow

Date of this Version

October 1981

Comments

Published by American Institute of Physics. J. Chem. Physics Volume 75, Issue 8, pp. 3719-3730 (1981). ©1981 American Institute of Physics. Permission to use. http://jcp.aip.org/.

Abstract

The polarized piezoreflection spectra of the first singlet system of anthracene and their Kramers-Kronig transforms are reported. Exciton energy strain shifts are reported for the b-polarized and for the ac-polarized factor group components. These values are shown to be in good agreement with related experimental data and with theoretical calculations. The piezomodulation spectra significantly enhance structure and are also sensitive to the extent of crystal coupling. Deviations in the measured spectra are observed in the a-polarized spectra from that calculated for the logarithmic derivative. These variances are attributed to coupling with the second singlet of anthracene or the presence of the ¹L_b transition.