# COLLISIONAL NARROWING OF HF FUNDAMENTAL BAND SPECTRAL LINES BY NEON AND $ARGON^{*}$

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 Title: COLLISIONAL NARROWING OF HF FUNDAMENTAL BAND SPECTRAL LINES BY NEON AND $ARGON^{*}$ Creators: Pine, A. S. Issue Date: 1980 Publisher: Ohio State University Abstract: Collisional narrowing has been observed for high J transitions in the fundamental absorption band of HF in the presence of neon and argon buffer gases, with neon providing the most pronounced Doppler width reduction. Detailed line profiles have been measured using a high-resolution tunable laser difference-frequency spectrometer in order to test various collisional lineshape models. The measured lineshapes and the pressure dependence of the widths have been least-squares fit it the limits of strong and weak velocity-changing collisions. Though both limits qualitatively explain the data, the systematic discrepancies indicate that an intermediate collision model would be more appropriate. In the case of HF/argon collisions, the resulting line profiles have a slight, but definite, asymmetry, implying a correlation between the velocity-and state-changing collisions. Description: $^{*}$This Work was sponsored by the Department of the Air Force. Author Institution: URI: http://hdl.handle.net/1811/11446 Other Identifiers: 1980-WF-1