Continuous-wave terahertz spectroscopy of biotin: Vibrational anharmonicity in the far-infrared

T. M. Korter, D. F. Plusquellic

Research output: Contribution to journalArticle

103 Scopus citations

Abstract

A high-resolution continuous-wave terahertz spectrometer has been used to investigate the absorption spectrum of biotin in a polyethylene matrix from 6 to 115 cm-1. Gaussian linewidths from least squares fits at 4.2 K are found to increase from 1 to 5 cm-1 over this region establishing conservative lower limits on the vibrational lifetimes from 5 to 1 ps. The calculated partition function of 1.0 at 4.2 K is shown to increase to 10 8 at 298 K indicating enormous changes in the sequence level populations with increasing temperature. Lineshape models that include mechanical anharmonicity were therefore necessary to obtain satisfactory fits at 298 K. Anharmonicity factors (χeν̄e/ ν̄e) range from 0.1% to 1% and establish their importance for refining model predictions.

Original languageEnglish (US)
Pages (from-to)45-51
Number of pages7
JournalChemical Physics Letters
Volume385
Issue number1-2
DOIs
StatePublished - Feb 2 2004
Externally publishedYes

ASJC Scopus subject areas

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

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