OSU Navigation Bar

The Ohio State University University Libraries Knowledge Bank

$N_{2}$ AND AIR BROADENING IN THE FUNDAMENTAL BANDS OF HF AND HCI

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/17060

Show full item record

Files Size Format View
1986-TB-11.jpg 152.1Kb JPEG image Thumbnail of $N_{2}$ AND AIR BROADENING IN THE FUNDAMENTAL BANDS OF HF AND HCI

Title: $N_{2}$ AND AIR BROADENING IN THE FUNDAMENTAL BANDS OF HF AND HCI
Creators: Pine, A. S.; Looney, J. P.
Issue Date: 1986
Publisher: Ohio State University
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.
URI: http://hdl.handle.net/1811/17060
Other Identifiers: 1986-TB-11
Bookmark and Share