MEASUREMENT OF VELOCITY DISTRIBUTIONS OF SPUTTERED CARBON ATOMS USING LASER INDUCED FLUORESCENCE IN THE VACUUM UV
Materials containing carbon such as graphites or carbides are often used as wall or limiter materials in fusion devices. For these materials, a knowledge of the velocity distribution of the sputtered particles is very important. Laser induced fluorescence is one method to obtain these data. Since the resonance lines of the C atom are in the vacuum UV wavelength range, tunable radiation has to be provided in this region. The transitions 2p 23-P -> 2p3s4P0 at 1657 angstroem have been excited by shifting dye laser radiation using stimulated Raman scattering in H2 (8th anti Stokes line). Sputtering experiments have been performed by bombarding graphite and TiC probes with 1.5 keV argon ions at a current of about 30 mA. We have measured velocity distributions which can be well approximated by a Thompson distribution with a surface energy of 8.3 eV.
Bibliographic Reference: JOURNAL OF NUCLEAR MATERIALS, NOS. 145-147 (1987), PP. 434-437
Record Number: 1989126027301 / Last updated on: 1989-01-01
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