Surface Recombination of Hydrogen Atoms on Pyrex in Medium Pressure Hydrogen Plasma

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Abstract

The probability of heterogeneous recombination of hydrogen atoms, γH , on the surface of a Pyrex tube in a direct current medium-pressure pure hydrogen (2–7 Torr) glow discharge was measured in dependence on the pressure and discharge current for two wall temperatures. It was found that there is no dependence of the recombination probability on the pressure and discharge current provided that the tube is pre-trained in a hydrogen discharge. During the tube training, γH decreases with a characteristic time to reach a steady-state value of ~30 minutes. Analysis of the possible recombination mechanism using quantum chemical methods revealed that the recombination of hydrogen atoms on the Pyrex surface is associated with OH radicals and oxygen vacancies on the surface, and the dynamics of γH can be explained by the recombination of surface OH radicals during tube training.

About the authors

I. I Ziganshin

Skobeltsyn Institute of Nuclear Physics; Lomonosov Moscow State University

Email: ilyaziganshin@gmail.com
Moscow, Russia

K. R Galiullin

Lomonosov Moscow State University

Moscow, Russia

D. V Lopaev

Skobeltsyn Institute of Nuclear Physics; Lomonosov Moscow State University

Email: d.lopaev@gmail.com
Moscow, Russia

E. A Kirillov

Skobeltsyn Institute of Nuclear Physics; Lomonosov Moscow State University

Moscow, Russia

A. T Rakhimov

Skobeltsyn Institute of Nuclear Physics; Lomonosov Moscow State University

Moscow, Russia

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