Electron Temperature Dependence of the Dissociative Recombination Coefficient of Molecular Argon Ions Ar⁺₂ with Electrons

Abstract

Key words Stationary afterglow plasma, microwave diagnostics of plasma, electron heating with microwaves, dissociative recombination, electron temperature dependence of recombination, molecular argon ions.A dual mode (T M 010 cylindrical cavity/cylindrical waveguide) microwave apparatus is used to study the ion mobility and dissociative recombination of molecular argon ions with electrons in the afterglow period of a d.c. glow discharge as a function of electron temperature when electrons were heated by microwaves up to Te ≤ 10300 K, with T+ = Tgas = 300 K. The electron temperature dependence of the total rate coefficient of dissociative recombination may be represented by α(Arwhich is in very good agreement with most previous experimental results but not with the recent theoretical calculations.

Electron and gas temperature dependences of the dissociative recombination coefficient of molecular ions {\rm Ar}_2^+ with electrons

“…Our measurements showed that the electron temperature dependence of this coefficient can be described as α(Ar + 2 ) ∼ α 0 (Ar + 2 )T −0.64 e (where α 0 (Ar + 2 ) is the value of the recombination coefficient at 300 K). This dependence is in very good agreement with the earliest experimental results, but not with recent theoretical calculations [8] as summarized in our paper [7]. We have pointed out that there are more recombination channels and the molecular argon ions can be in different vibrational states.…”

“…In our recently published paper [7] we concentrated on the electron temperature dependence of the dissociative recombination coefficient of molecular argon ions Ar + 2 with electrons. Our measurements showed that the electron temperature dependence of this coefficient can be described as α(Ar + 2 ) ∼ α 0 (Ar + 2 )T −0.64 e (where α 0 (Ar + 2 ) is the value of the recombination coefficient at 300 K).…”

Pressure dependence of Ar${\hspace{0pt}}_2^+$ , ArTi+, and Ti${\hspace{0pt}}_2^+$ dimer formation in a magnetron sputtering discharge

“…Most Ar + 2 ions have small kinetic energies and only at the lowest pressure a high-component is present. The origin of Ar + 2 ions are gas phase processes, in particular, three-body reactions of Ar + ions with two neutral argon atoms [41][42][43][44][45],…”

“…The condition holds for excited Ar * * (4d), Ar * * (6s), and all higher excited levels [41]. Loss of Ar + 2 molecules takes place via electron impact-induced dissociation [41][42][43][44][45][46] Ar…”

Прямое Диссоциативное Возбуждение Гетероядерных И Гомоядерных Ионов Инертных Газов Электронным Ударом

“…Здесь v и J -колебательное и вращательное квантовые числа иона BA + в начальном электронном состоянии |i . Процесс (1) интенсивно изучался ранее как экспериментально [20][21], так и теоретически [25][26][27][28][29][30][31] для многообразия простых, сложных и кластерных ионов (подробнее см. [17,32,33]).…”