Abstract
Hydrogen evolution and, to a smaller extent, that of hydrocarbon gases is fo0n0 during rotation of vacuum ground-glass joints lubricated by standard vacuum greases. Up to (0.1–50) × 10 12 hydrogen molecules can evolve per one revolution of the inner fitting of the joint. Investigation of the mechanism of the process has demonstrated that molecular hydrogen is formed in reactions of hydrogen atoms generated by a nonidentified primary tribochemical process. Hydrogen evolution was also observed in the process of closing the metal high vacuum valves in the vacuum system of the mass spectrometer: the integral number of hydrogen molecules was about 10 11−10 12.
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