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Proceedings Paper

Coherence in UV resonance Raman spectroscopy of liquid benzene and toluene, but not ice
Author(s): Hans D. Hallen; Ryan R. Neely; Adam H. Willitsford; C. Todd Chadwick; C. Russell Philbrick
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Paper Abstract

We have measured UV resonance Raman scattering at and near the resonance absorption lines of liquid benzene and toluene. Resonance occurs for excitation on the symmetry-forbidden but strongly phonon coupled states in the 1B2u band, ~230-270 nm, resulting in enhancements corresponding to the vapor phase absorptions rather than those of the liquid phase. This effect is related to the coherence forced by the internal molecular resonance required to absorb light at this energy. The resonance gains (~1000x) are larger than expected due to the narrower vapor phase lines. Several multiplet and overtone modes are enhanced along with the strongly coupled ring-breathing mode. A contrasting case of resonance Raman of ice is also discussed; in this case resonance is observed for excitation energy corresponding to absorptions that depend upon the final state shielding by the neighbors, and corresponds with the solid phase absorption. This typifies the more common, slow, time dependence of the resonance Raman process.

Paper Details

Date Published: 28 September 2013
PDF: 9 pages
Proc. SPIE 8845, Ultrafast Imaging and Spectroscopy, 884511 (28 September 2013); doi: 10.1117/12.2024313
Show Author Affiliations
Hans D. Hallen, North Carolina State Univ. (United States)
Ryan R. Neely, North Carolina State Univ. (United States)
Adam H. Willitsford, Johns Hopkins Univ. Applied Physics Lab. (United States)
C. Todd Chadwick, North Carolina State Univ. (United States)
C. Russell Philbrick, North Carolina State Univ. (United States)

Published in SPIE Proceedings Vol. 8845:
Ultrafast Imaging and Spectroscopy
Zhiwen Liu, Editor(s)

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