Vibrational relaxation of an amino acid in aqueous solution

Shinsuke Shigeto, Dana D. Dlott

Research output: Contribution to journalArticlepeer-review

Abstract

Time-resolved Raman spectroscopy is used to study vibrational energy redistribution after CH-stretch excitation, of glycine zwitterion in aqueous solution. Anti-Stokes Raman monitors the glycine vibrations and Stokes Raman monitors heating of the surrounding water, which acts as a molecular thermometer. A three-step mechanism is proposed for vibrational cooling (VC) that includes 0.8 ps decay of the parent CH-stretch, 1.0 ps relaxation of the midrange vibrations and 1.2 ps relaxation of the lower-energy vibrations. The overall VC process observed by the molecular thermometer is represented by a 1.8 ps time constant.

Original languageEnglish (US)
Pages (from-to)134-139
Number of pages6
JournalChemical Physics Letters
Volume447
Issue number1-3
DOIs
StatePublished - Oct 15 2007

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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