Measurement of the self-broadening of theH2Q(0–5) Raman transitions from 295 to 1000 K

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Abstract
High-resolution inverse Raman spectroscopy has been used to measure the self-broadening coefficients of the Raman Q-branch transitions in pure (natural) hydrogen. Measurements of six lines [Q(0)–Q(5)] were made at pressures from 2 to 50 atm and from 295 to 1000 K. The dependence of the derived broadening coefficients on temperature and rotational quantum number is analyzed using the energy-corrected sudden scaling law [A. E. DePristo, J. Chem. Phys. 73, 2145 (1980)]. We discuss three models for the J dependence of the pure-vibrational dephasing and find that models with little or no J dependence in the pure-vibrational dephasing are preferred.