Carbon chemistry due to combined H+ and O+ irradiation

被引:14
作者
Haasz, AA [1 ]
Chen, AYK [1 ]
Davis, JW [1 ]
Vietzke, E [1 ]
机构
[1] FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST PLASMAPHYS, EURATOM ASSOC, D-52425 JULICH, GERMANY
基金
欧盟地平线“2020”; 加拿大自然科学与工程研究理事会;
关键词
PYROLYTIC-GRAPHITE; HYDROCARBON FORMATION; CHEMICAL EROSION; SIMULTANEOUS BOMBARDMENT; MOLECULE FORMATION; METHANE FORMATION; ATOMIC-HYDROGEN; IMPACT; IONS; DEUTERIUM;
D O I
10.1016/S0022-3115(97)00112-8
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
An investigation of carbon chemistry due to simultaneous H+ and O+ impact of pyrolytic graphite is presented. As an introduction, an overview is given of previous results related to the chemical erosion processes of graphite due to single-species impact by hydrogen and oxygen. Some limited previous synergistic results of various multispecies impact studies of graphite are also presented. In the present investigation, pyrolytic graphite (Union Carbide HPG99) was exposed to 5 keV O+ and 1 keV H+, resulting in a 10-20% reduction of CO and CO2 erosion yields (in comparison with the O+-only case) for flux ratios of phi(O+)/phi(H+)similar to 6-27%. Maximum CO and CO2 reduction was observed at similar to 800 K graphite temperature. In addition, water production was observed with a maximum of similar to 0.15 H2O/O+ at similar to 800 K. Only a small reduction (similar to 5-10%) in the methane yield (CH4/H+) was seen. (C) 1997 Elsevier Science B.V.
引用
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页码:19 / 26
页数:8
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