Noble gas induced line-shift and line-broadening in the ν2band of H2S

The rotational dependence of pressure-induced shift and broadening of H2S absorption lines in the ν2band due to collisions between H2S molecules and atoms of noble gases (He, Ne, Ar, Kr, and Xe) were studied in the spectral region between 1050 and 1325cm−1. The measurements were carried out using an improved pulse-driven diode laser spectrometer, allowing a new tuning technique of the diode laser. The parameters of this set-up will be compared to the parameters of the previously used spectrometer. The data concerning collisional broadening and shift coefficients, γand δ, respectively, and their dependencies on the rotational quantum number, J″, mass, and the polarizability, α, of the noble gases are presented for 14 P-branch transitions (3≤J″≤8), seven Q-branch transitions (7≤J″≤10), and 18 R-branch transitions (2≤J″≤11). The broadening coefficients were determined with an accuracy of 1% (3.5×10−4cm−1/atm) and shift coefficients were determined with an uncertainty of less than 5×10−4cm−1/atm for the majority of lines and broadening gases. The qualitative explanation of experimental results was made based on the models and interactions also used in the ATC and CRB theories, respectively.