dc.creator Pine, A. S. en_US dc.creator Looney, J. P. en_US dc.date.accessioned 2006-06-15T17:54:54Z dc.date.available 2006-06-15T17:54:54Z dc.date.issued 1986 en_US dc.identifier 1986-TB-11 en_US dc.identifier.uri http://hdl.handle.net/1811/17060 dc.description Address of Pine: Molecular Spectroscopy Division, National Bureau of Standards, Gaithersburg, MD 208. Address of Looney: Department of Physics, Pennsylvania State University, University Park, PA 16802. en_US dc.description Author Institution: en_US dc.description.abstract $N_{2}$ and air broadened lineshapes of HF and HCl transitions in the $v = 1 \leftarrow 0$ bands have been measured at T-295 and 202 K with a high-resolution difference-frequency laser spectrometer. Pressure broadening and shifts and collisional narrowing parameters have been extracted by least squares fitting of several collisional profiles to the spectra. At low pressures, the collisional, or Dicke, narrowing effect causes deviations from the Voigt profile having a Doppler-fixed Gaussian component and yields a measure of the diffusion constants for the hydrogen halides in the buffer gases. At high J, where the pressure shifts are comparable to or larger than the broadenings, a slight asymmetry is observed in the lineshapes which is attributed to statistical correlation between velocity- and states-changing collisions. The ration of air-to-$N_{2}$ broadening varies systematically with rotational level and is always somewhat larger than that given by the relative quadrupolar contributions of $O_{2}$ and $N_{2}$. The temperature variations in the broadening coefficients are also J dependent, deviating significantly from $T^{-1/2}$ and exhibiting opposite behavior for HF and HCl. en_US dc.format.extent 155755 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title $N_{2}$ AND AIR BROADENING IN THE FUNDAMENTAL BANDS OF HF AND HCI en_US dc.type article en_US
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