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| Abstract |
The present study shows recent progress in the depth profiling of deuterium near the surface of basal oriented (BO) and edge oriented (EO) Highly Oriented Pyrolytic Graphite (HOPG) and the isotropic g...raphite obtained by using elastic recoil detection (ERD) method. The implantatiorls were made at R. T. with 8 keV D2+ ions to the fluences up to-1022D/m2 at normal incidence. The depth distribution curves of the deuterium in basa1, edge oriented and the isotropic graphite were compared each other In this study, four types edge oriented (EO) HOPG have been investigated: ZYA, ZYB, ZYD, ZYH grade from Union Carbide, USA. The grades were classified according to mosaic spread. ZYA is most high quality HOPG. Depth profiles obtained for EO-ZYA samples were almost uniform, namely, showed constant concentration for depth. Careful determination of the saturation concentration yielded a value of 10% D atoms /C atoms. The other HOPG samples also showed uniform depth distribution, but the concentration were 2-3 times higher than that in ZYA.show more
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