N2-, O2- and air-broadened half-widths and line shifts for transitions in the ν3 band of methane in the 2726- to 3200-cm−1 spectral region

The HITRAN2012 molecular spectroscopic database

“…[140,141]. For the pentad, about 500 prior measurements [138] were used along with approximately 3800 predicted values for γ air , n, and δ of the ν 3 transitions from Antony et al [142]. Scaled N 2 -broadening from Frankenberg et al [132] were inserted from 5860 to 6184 cm -1 and a few hundred values for γ air , were entered between 5560 to 5860 cm -1 [143].…”

Line broadening coefficient calculations for methane perturbed by nitrogen

“…water [59] or nitric acid [60]. In the latest application of this theory to the case of methane perturbed by nitrogen [44], a classical formalism was used to describe the wavefunctions of the active molecule. It is classical in the sense that methane eigenfunctions were developed in terms of rotation group basis functions.…”

“…For what concerns the interaction potential, we have adopted the parameters from Ref. [44] or average values from Refs. [44,79] (2),N 2 = − 1.375 D.Å.…”

“…[44] or average values from Refs. [44,79] (2),N 2 = − 1.375 D.Å. We write the short range interaction between atom 1i of methane and atom 2j of nitrogen as…”

“…A review of earlier experimental studies may be found in Ref. [44]. Here, we will be concerned by a model for the calculations of broadening coefficients for individual spectral lines.…”