# ASYMMETRIES AND CORRELATIONS IN SPEED-DEPENDENT DICKE-NARROWED SPECTRAL PROFILES

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 Title: ASYMMETRIES AND CORRELATIONS IN SPEED-DEPENDENT DICKE-NARROWED SPECTRAL PROFILES Creators: Pine, A. S. Issue Date: 1998 Publisher: Ohio State University Abstract: Asymmetric line shapes are known to result from correlations between velocity-changing (Dicke-narrowing) and dephasing (pressure-broadening) $collisions^{a}$ and from speed-dependent broadening and shifting coefficients arising from relative kinetic-energy-dependent collision $cross-sections^{b c d}$. Here, we superpose the uncorrelated and correlated strong collision models of Rautian and Sobelman, similar to Joubert $et al.^{e}$, combined with various speed-dependent models in order to determine the contributions of these effects in measured spectral profiles. The sense of the asymmetries and the pressure and temperature dependencies of the detailed shapes, as well as physical constraints from diffusion and state-to-state rate measurements, all provide clues to the line shape parameters, their correlation and their speed dependence. Description: $^{a}$S. Rautian and I. Sobelman, Sov. Phys. Usp. 9, 701 (1967). $^{b}$P. Berman, JQSRT 12, 1331 (1972). $^{c}$J. Ward, J. Cooper and E. Smith, JQSRT 14, 555 (1974). $^{d}$H. Pickett, J. Chem. Phys. 73, 6090 (1980). $^{e}$P. Joubert, J. Bonamy, D. Robert, J. Domenech and D. Bermejo, JQSRT (to be published). Author Institution: Alpine Technologies, 14401 Poplar Hill Road URI: http://hdl.handle.net/1811/19061 Other Identifiers: 1998-TF-11