The influence of deuterium exposures on subsequent outgassing rate of an UHV system

摘要: Abstract The accuracy of results in experiments where a well-processed UHV system is exposed to hydrogen depends on the absorption rate and kinetics subsequent spontaneous release from itself. In date, sensitivity required detect very low rates has been achieved only when tritium used as tracer gas. Unfortunately, tritiated water surface prevails among released gas species which not expected for well-outgassed surfaces. present studies, behaviour at 303 K during three deuterium exposures duration 92 72 h an initial pressure 1 mbar was explored. decrease constant whole these periods monitored by non-ionizing vacuum gauges. It corresponded effective sticking probability order 1 × 10 - 12 resulted 5 14 D atoms/cm2. were observed several days starting immediately after had pumped system. Initially, exceeded background outgassing more than orders magnitude. These demonstrate that extremely high can be with precise measuring technique otherwise attributed exclusively scintillation methods.