Nonadditivity of convoy- and secondary-electron yields in the forward-electron emission from thin carbon foils under irradiation of fast carbon-cluster ions
Nonadditivity of convoy- and secondary-electron yields in the forward-electron emission from thin carbon foils under irradiation of fast carbon-cluster ions
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快碳簇离子辐照下薄碳箔正向电子发射中护航电子产额和二次电子产额的非加和性
DOI：
10.1103/physreva.73.060901
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
H. Kudo
中科院分区：
文献类型：
--
作者：
S. Tomita;S. Yoda;R. Uchiyama;S. Ishii;K. Sasa;T. Kaneko;H. Kudo
我们已经测量了二次电子产生的快速碳团簇C n + n =1-4轰击薄碳箔3.2，7.3，11.9，和20.3克/厘米2的能谱。对于相同速度的团簇，随着团簇尺寸n的增加，传输电子产额增加，而二次电子产额减少。归一化到注入原子数的护送电子的产率随团簇尺寸n成比例地增加。这种比例表明，只有一个弱的Victim效应的数量上的初级电子散射的弹丸。因此，在低能二次电子中观察到的维克斯效应必然是由通过表面的输运或透射引起的。
We have measured energy spectra of secondary electrons produced by fast-carbon-cluster C n + n =1–4 bombardment of thin carbon foils 3.2, 7.3, 11.9, and 20.3 g/c m 2 . For clusters of identical velocity, the convoy-electron yield is enhanced with increasing cluster size n, while the yield of secondary electrons is reduced. The yield of convoy electrons normalized to the number of injected atoms increases proportionally with cluster size n. This proportionality suggests that there is only a weak vicinage effect on the number of primary electrons scattered by the projectile. The vicinage effect observed in low-energy secondary electrons must therefore arise from either transport or transmission through the surface.