Thermal desorption of hydrogen and various hydrocarbons from graphite bombarded with thermal and energetic hydrogen
Thermal desorption of hydrogen and various hydrocarbons from graphite bombarded with thermal and energetic hydrogen
复制标题
用热氢和高能氢轰击石墨中氢气和各种碳氢化合物的热解吸
DOI：
10.1016/0022-3115(87)90346-1
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
K. Flaskamp
中科院分区：
文献类型：
--
作者：
V. Philipps;E. Vietzke;M. Erdweg;K. Flaskamp
研究了热解石墨在不同条件下暴露于热氢和高能氢后氢（氘）和烃类的热释放。在将石墨暴露于热氢原子之后，保留的氢在随后的加热中在两个不同的解吸过程中解吸，由此自由基CH 3、C2Hx和C3Hx物质在第一解吸过程中与氢分子一起解吸。形成的碳氢化合物的绝对量达到约0.25的解吸H2的量，并遵循类似的通量依赖性的H2解吸。用高能惰性离子（Ar−）和热氢原子同时轰击石墨表面增加了氢的保留并改变了氢的解吸光谱，而烃解吸光谱保持不变。在用高能氢离子轰击石墨的情况下（研究EH> 350eV），C2和C3型烃的脱附与甲烷的脱附相比可以忽略不计。甲烷解吸本身的特点是由一个尖锐的通量依赖性和CH4分子的形成。
The thermal release of hydrogen (deuterium) and hydrocarbons has been investigated after exposing pyrolytic graphite to thermal and energetic hydrogen under various conditions. After exposing graphite to thermal hydrogen atoms, the retained hydrogen desorbs in the subsequent heating in two different desorption processes whereby the radical CH3, C2Hxand C3Hxspecies desorb together with the hydrogen molecule in the first desorption process. Absolute amounts of the hydrocarbons formed reach about 0.25 of the amount of desorbed H2and follow a similar fluence dependence as the H2desorption. The simultaneous bombardment of the graphite surface with energetic inert ions (Ar−) and with thermal hydrogen atoms increases the retention of hydrogen and changes the desorption spectrum of the hydrogen whereas the hydrocarbon desorption spectrum remains unchanged. In the case of bombarding graphite with energetic hydrogen ions (investigated forEH> 350eV) the desorption of C2and C3type hydrocarbons is negligible compared to that of methane. The methane desorption itself is characterized by a sharp fluence dependence and by the formation of CH4molecules.