# EFFECT OF COLLISIONS ON LINE PROFILES IN THE QUADRUPOLE AND RAMAN SPECTRA OF MOLECULAR $HYDROGEN^{*}$

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 Title: EFFECT OF COLLISIONS ON LINE PROFILES IN THE QUADRUPOLE AND RAMAN SPECTRA OF MOLECULAR $HYDROGEN^{*}$ Creators: Kelley, J. D.; Bragg, S. L. Issue Date: 1985 Abstract: An extensive set of data now exists for line shifts and collision broadening coefficients in molecular hydrogen. Collision broadening has been studied in the pure rotational Raman $spectrum,^{1}$ the fundamental (1-0) $Raman^{2}$ and $quadrupole^{3}$ vibrational bands, and in the 2-0 to 4-0 quadrupole overtone $bands.^{3}$ Line-shift measurements in the fundamental and first overtone bands are also $available.^{2-4}$ This data set allows decomposition of the total broadening coefficient into separate contributions from collisional effects on the rotational and vibrational degrees of freedom. Moreover, comparison of line shift and broadening coefficients permits subdivision of the vibrational effects into collisional phase-shift and near-resonant vibrational energy exchange processes. The various collisional contributions to the broadening and line-shift coefficients will be discussed, with emphasis on the relationship of these quantities to the $H_{2} - H_{2}$ intermolecular potential. URI: http://hdl.handle.net/1811/12149 Other Identifiers: 1985-RC-2