Exciton and vibronic effects in the spectroscopy of bianthracene in supersonic beams
- Creators
- Khundkar, Lutfur R.
- Zewail, Ahmed H.
Abstract
Excitation and dispersed fluorescence spectra of 9,9'‐bianthracene in a supersonic expansion are reported. The spectra are anthracene‐like, indicating that the rings are weakly coupled. Exciton effects are considered in the interpretation of the spectra. The torsional potential in S_1 is modeled as a double‐well (Gaussian perturbation on a one‐dimensional harmonic oscillator) with barriers to perpendicularity and planarity of ∼30 and ∼1100 cm^(−1), respectively. The S_0 torsional potential shows negative anharmonicity which is modeled as a quartic perturbation. Anthracenic modes in S_1 and S_0 are also assigned. Finally, measurements of S_1 fluorescence lifetimes up to ∼6000 cm^(−1) excess energy in the excited state show no evidence of charge transfer.
Additional Information
© 1986 American Institute of Physics. Received 01 October 1985 Accepted 30 October 1985. It is a pleasure to acknowledge the National Science Foundation (Grant No. DMR-8521191) for its support of this research. We also thank Dr. Jack A. Syage and Dr. Peter M. Felker for their generous assistance in recording the spectra and for many helpful discussions.Attached Files
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Additional details
- Eprint ID
- 70465
- Resolver ID
- CaltechAUTHORS:20160920-105243107
- DMR-8521191
- NSF
- Created
-
2016-09-29Created from EPrint's datestamp field
- Updated
-
2021-11-11Created from EPrint's last_modified field
- Other Numbering System Name
- Arthur Amos Noyes Laboratory of Chemical Physics
- Other Numbering System Identifier
- 7306