Vibrational energy exchange between H2(v=1) and D2, N2, HCl, and CO2

Publisher Website
Google Scholar
Abstract
The vibrational relaxation of H2(v=1) by D2, N2, HCl, and CO2 was studied at 295°K by a laser‐induced fluorescence technique. HF added in small quantities to the gas mixtures and vibrationally excited by a pulsed HF TEA laser produced H2(v=1) by V–V transfer; HF also served as the tracer for H2(v=1). The results were interpreted to be primarily V–V rates; the values being (1.25±0.15) ×10−3, (3.14±0.4) ×10−4, (2.1±0.3) ×10−6, and (4.4±0.9) ×10−4(μsec Torr)−1 for H2(v=1) transfer to HCl, D2, N2, and CO2, respectively. The data for D2 and N2 were correlated with the V–V exchange probabilities for other diatom–diatom collisions by the parameter μ1/2ΔE, where μ is the reduced mass of the collision partners and ΔE the energy mismatch. This parameter also correlates V–V exchange probabilities for CO2–diatom collisions. A separate correlation of V–V exchange probabilities for hydrogen halide–homonuclear diatom collisions was obtained by plotting the probabilities versus ΔE/hν.