A magnetic sector atom-probe FIM has been successfully operated for dc field evaporation of tip materials such as Rh, W, Ir, Mo and Ti. A limited number of evaporated metal ions were clearly identified forming a line spectrum. Field evaporation of Rh in the presence of 3He and 4He gases showed that the formation of the helium compound (RhHe)2+ is quite sensitive to He gas pressure; no helium compound were observed below 5 × 10-7 Torr and all ions detected as helium compound above 5 × 10-5 Torr at 78 K.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Condensed Matter Physics
- Surfaces and Interfaces