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首页> 外文期刊>Physical Review. Accelerators and Beams >Thermally assisted photoemission effect on CeB6and LaB6 for application as photocathodes
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Thermally assisted photoemission effect on CeB6and LaB6 for application as photocathodes

机译：对CeB6和LaB6的热辅助光发射效应用作光电阴极

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The thermally assisted photoemission (TAPE) effect was investigated for the hexaboride thermionic cathodes (${mathrm{LaB}}_{6}$ and ${mathrm{CeB}}_{6}$). It was found that the quantum efficiency of these cathodes can be increased by raising the cathode temperature along with the thermionic emission. In addition both materials can emit a measurable photoemission current by being irradiated with a laser having a photon energy below the work function at sufficiently high cathode temperatures. Our measurements indicate that this process is linear. These results show the significance of the TAPE effect. An additional effect of cathode heating is surface cleaning. This effect was detected as the hysteresis of the quantum efficiency which can be observed by heating up and cooling down the cathode. This effect slightly changes the quantum efficiency but not as much as the TAPE effect.
机译：研究了六硼化物热电子阴极（$ { mathrm {LaB}} _ {6} $和$ { mathrm {CeB}} _ {6} $）的热辅助光发射（TAPE）效应。发现通过提高阴极温度和热电子发射可以提高这些阴极的量子效率。另外，在足够高的阴极温度下，通过用光子能量低于功函数的激光照射两种材料，可以发射可测量的光发射电流。我们的测量表明该过程是线性的。这些结果表明了TAPE效应的重要性。阴极加热的另一个作用是表面清洁。该效应被检测为量子效率的滞后现象，可以通过加热和冷却阴极来观察到。这种效应会稍微改变量子效率，但不会像TAPE效应那样大。

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