Energy transfer of argon excited diatomic molecules

Abstract

Argon excited diatomic molecules Ar*2(3𝒥+u)were produced by irradiating argon gas with short electron beam pulses. The kinetic behavior was studied by monitoring the time dependence of the 987.6 nm absorption band due to Ar*2 under various conditions.The method is largely different from the vacuum UV emission spectroscopy used previously in such kinetic studies. Ar*2 was found to be produced by a three-body reaction with a rate constant of (1.0±0.3) ×10−32 cm 6 sec−1. Then, the rate constants and cross sections of energy transfer were determined for 12 fundamental acceptor molecules. The theoretical formula proposed previously for Penning ionization was applied to energy transfer between Ar*2 cross sections given by the formula have the values comparable to the observed ones.

DBD‐based plasma polymerization from monomer‐argon mixtures: Analytical model of monomer reactions with excited argon species

“…Comparisons of quenching rate constants of different Ar[1s] states and the triplet excimers Ar 2 [ 3 Σ u + ], respectively, with several atoms and small molecules frequently reveal less variation. For methane, for example, all data fall between 3.3 and 6.3 · 10 −10 cm 3 s −1 .…”

Microscopic simulation of xenon-based optical TPCs in the presence of molecular additives

“…Since the rates for these processes are not known for xenon, we resort to the values measured for the associated atomic states, according to the observations made for instance for Ar * and Ar * 2 in the case of CO 2 , CH 4 and several other additives in [71]. The main uncertainties for a reliable prediction of the scintillation of doped xenon can be a priori expected from the last two processes (i.e., the nature of 3-body reactions with additives and the excimer quenching), so different extreme situations are evaluated in section 5, and their agreement with present data discussed.…”

Photon emission and atomic collision processes in two-phase argon doped with xenon and nitrogen

“…Despite the relatively large rate constants of reactions (4) and (5), describing the excitation transfer from Ar * and Ar * 2 states to Xe [12,13,58,59], their contributions are negligible due to the extremely low Xe content in the gas phase: compare their τ T P to those of reactions (1) and (2). N * 2 (C) versus Ar * 2 emission in the gas phase.…”