Spectral profile of ro-vibrational transitions of HCl broadened by He, Ar and SF6: testing the β-correction to the Hartmann-Tran profile and the speed dependent (complex) hard collision model
arxiv(2024)
摘要
The β-correction to the Hartmann-Tran (HT) profile, recently introduced
to model the spectral shape of a molecular transition strongly affected by the
Dicke narrowing effect (Konefal et al., JQSRT 242 (2020) 106784), the HT
profile (Ngo et al., JQSRT 129 (2013) 89), and the speed dependent (complex)
hard collision model (SDcHC, in which the velocity changing collision rate is
characterized by a complex number) are tested using spectra of two
rovibrational lines of HCl. The R(5) and R(9) lines of the fundamental band of
HCl broadened by He, Ar and SF_6 have been recorded with a
difference-frequency laser spectrometer for total pressures ranging from 12 to
930 mbar. These lines, measured in large pressure ranges with different
collision-partners provide a meaningful test of the above-mentioned line-shape
models. The results confirm that non-Voigt effects are significant for HCl
broadened by Ar and SF_6 and mainly due to the large influence of the Dicke
narrowing effect. For HCl-SF_6 and HCl-Ar, especially for the R(9) line,
using the β-correction together with the HT profile (and with the
speed-dependent hard collision model, SDHC) significantly improves the fit
residuals while it has no effect on (or tends to deteriorate) the quality of
the fit for HCl-He and for the R(5) line of HCl-SF_6, for which the influence
of velocity changing collisions is smaller. Except for HCl-He, the SDcHC model
leads to better quality of fit compared to the HT profile. The results also
show that numerical correlations between refined line-shape parameters of the
HT profile are important and can lead to ill-determined parameters while they
are more properly determined with the SDcHC model.
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