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首页> 外文期刊>Journal of Applied Physics >Role of deuterium desorption kinetics on the thermionic emission properties of polycrystalline diamond films with respect to kinetic isotope effects
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Role of deuterium desorption kinetics on the thermionic emission properties of polycrystalline diamond films with respect to kinetic isotope effects

机译：氘解吸动力学对多晶金刚石薄膜热同位素发射动力学同位素效应的作用

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摘要

The desorption kinetics of deuterium from polycrystalline chemical vapor deposited diamond films were characterized by monitoring the isothermal thermionic emission current behavior. The reaction was observed to follow a first-order trend as evidenced by the decay rate of the thermionic emission current over time which is in agreement with previously reported studies. However, an Arrhenius plot of the reaction rates at each tested temperature did not exhibit the typical linear behavior which appears to contradict past observations of the hydrogen (or deuterium) desorption reaction from diamond. This observed deviation from linearity, specifically at lower temperatures, has been attributed to non-classical processes. Though no known previous studies reported similar deviations, a reanalysis of the data obtained in the present study was performed to account for tunneling which appeared to add merit to this hypothesis. Additional investigations were performed by reevaluating previously reported data involving the desorption of hydrogen (as opposed to deuterium) from diamond which further indicated this reaction to be dominated by tunneling at the temperatures tested in this study (<775 °C). An activation energy of 3.19 eV and a pre-exponential constant of 2.3 × 1012 s−1 were determined for the desorption reaction of deuterium from diamond which is in agreement with previously reported studies.
机译：通过监测等温热电子发射电流行为表征了氘从多晶化学气相沉积金刚石薄膜中的解吸动力学。观察到该反应遵循一阶趋势，这由热电子发射电流随时间的衰减率证明，这与先前报道的研究一致。但是，在每个测试温度下的反应速率的阿伦尼乌斯图都没有表现出典型的线性行为，这似乎与以往对钻石中氢（或氘）解吸反应的观察结果相矛盾。这种观察到的线性偏差，特别是在较低温度下，是由于非经典过程造成的。尽管以前没有已知的研究报告了类似的偏差，但对本研究中获得的数据进行了重新分析，以解释隧道效应，这似乎为这一假设增加了价值。通过重新评估先前报道的涉及钻石中氢（而不是氘）解吸的数据，进行了进一步的研究，该数据进一步表明，在该研究中测试的温度（<775°C）下，该反应受隧穿作用的支配。测定氘在金刚石中的脱附反应的活化能为3.19 eV，指数前常数为2.3×10 12 s -1 报告的研究。

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