Abstract
Speed-dependent broadenings and shifts have been determined for the P and R branches of the ν 3 band of CH 4 perturbed by Ar and N 2 using a multispectrum fitting analysis of high-resolution tunable difference-frequency laser spectra recorded at pressures ≤67 kPa. For J≥3, the tetrahedral fine structure components in each J manifold are collisionally coupled and exhibit significant interference. The coupled lines are treated using a speed-dependent first-order line-mixing profile and are compared to a speed-independent full relaxation matrix inversion procedure with off-diagonal coupling elements calculated from an atom–atom Lennard–Jones potential model.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
