DEPTH SELECTIVE CEMS APPLIED TO THE EXAMINATION OF THE CONDITIONS IN VACUUM-SYSTEMS

Depth selective CEMS has been used to study surface contaminations on iron in vacuum systems. In an oil-diffusion-pumped system iron carbonate was found after iron was annealed at 750 degree C for several hours. In a turbopumped system austenite was formed after annealing, following a long pumping period and repeated successful reduction-oxidation cycles. The depth distributions were determined with rather good accuracy.