Abstract

The peculiarities inherent to a-C:H film removal, Mo oxidation in a flowing glow discharge of oxygen, and molybdenum-oxide reduction in deuterium discharge are investigated at T = 300–320 K. After carbon is removed under O2 discharge conditions, a steady-state MoO3 layer with a limiting thickness of 25–30 nm is formed on large-block molybdenum with the predominant orientation Mo(110). Oxide films are reduced in deuterium plasma at a selective sputtering yield on the order of 0.01 O atom/D+2 ion. If the interior Mo surfaces of a thermonuclear reactor are cleaned of hydrocarbon sediments via oxygen discharge, the working chamber must be additionally exposed to deuterium plasma for 8–10 h to remove oxygen from the generated a-MoO3 layers with the greatest possible oxygen content of 4–4.5 µg/cm2.

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