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Recombination of hydrogen atoms on fine-grain graphite

机译：氢原子在细晶粒石墨上的重组

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The probability of recombination of hydrogen atoms on surfaces of fine-grain graphite EK98 was investigated as a function of surface roughness. The source of hydrogen atoms used in this experiment was weakly ionised plasma created with an inductively coupled radiofrequency generator at pressures from 30 Pa to 175 Pa in hydrogen. Hydrogen atom density was measured by means of fibre optic catalytic probes. The recombination coefficient of the graphite samples was determined by observing their impact on the spatial distribution of the atom density in a closed side-arm of the reactor. Smith's diffusion model was used to calculate the values of the recombination coefficient. The measured recombination coefficient was found to increase much faster than the measured effective surface. This discrepancy is explained by the fact that on a surface which is not perfectly flat, there is a finite probability for multiple collisions. Impinging atoms collide more than once with the surface before they are reflected into the surface, which results in a larger probability of recombination.
机译：研究了细晶粒石墨EK98表面氢原子重组的概率与表面粗糙度的关系。本实验中使用的氢原子源是由感应耦合射频发生器在30 Pa至175 Pa的氢气压力下产生的弱电离等离子体。氢原子密度通过光纤催化探针测量。通过观察石墨样品对反应器封闭侧臂中原子密度的空间分布的影响来确定其重组系数。使用史密斯扩散模型来计算重组系数的值。发现测得的复合系数比测得的有效表面增长快得多。这种差异可以通过以下事实来解释：在并非完全平坦的表面上，发生多次碰撞的可能性有限。撞击原子在被反射到表面之前与表面碰撞不止一次，这导致更大的重组可能性。

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