UV resonance Raman signatures of phonon-allowed absorptions and phonon-driven bubble formation

Hans D. Hallen; Adam Willitsford; Reagan Weeks; C. Russell Philbrick

doi:10.1117/12.2188528

26 August 2015 UV resonance Raman signatures of phonon-allowed absorptions and phonon-driven bubble formation

Hans D. Hallen, Adam Willitsford, Reagan Weeks, C. Russell Philbrick

Proceedings Volume 9584, Ultrafast Nonlinear Imaging and Spectroscopy III; 95840P (2015) https://doi.org/10.1117/12.2188528
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

We have measured UV resonance Raman near and at the resonance phonon-allowed absorption lines of several liquid species. Resonance absorption with excitation on the symmetry-forbidden but strongly phonon coupled bands in the 230- 290 nm spectral band present enhancement 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. Large resonance gains (~3500x) reflect the narrower vapor phase lines. At the low laser fluence used, bubble formation is observed when the excitation energy corresponds to the maximum in Raman signal generation, not at the wavelength of maximum absorption in the liquid sample, which is several nanometers away.

Citation Download Citation

Hans D. Hallen, Adam Willitsford, Reagan Weeks, and C. Russell Philbrick "UV resonance Raman signatures of phonon-allowed absorptions and phonon-driven bubble formation", Proc. SPIE 9584, Ultrafast Nonlinear Imaging and Spectroscopy III, 95840P (26 August 2015); https://doi.org/10.1117/12.2188528

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