As. Pine et al., N2, O2, H-2, AR AND HE BROADENING IN THE NU(1) BAND OF NH3, Journal of quantitative spectroscopy & radiative transfer, 50(4), 1993, pp. 337-348
N2-, O2-, H-2-, Ar- and He-broadening coefficients and pressure shifts
have been measured for Q- and R-branch transitions in the nu1 fundame
ntal band of ammonia using a difference-frequency laser spectrometer.
The J-K dependence of the broadening coefficients is much smaller than
previously observed for self broadening of NH3. Semiclassical line br
oadening calculations for N2 broadening are in reasonable quantitative
agreement with the data, but they also exaggerate the J-K dependence.
Dicke narrowing is observed as strong deviations from Voigt profiles
at intermediate pressures and provides estimates for optical diffusion
constants which correlate well with the mass diffusion constants for
NH3 in the various buffer gases.