Reduction in the energy loss of 0.5-MeV-per-atom carbon-cluster ions in thin carbon foils
Reduction in the energy loss of 0.5-MeV-per-atom carbon-cluster ions in thin carbon foils
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减少薄碳箔中每个原子碳簇离子 0.5 MeV 的能量损失
DOI：
10.1103/physreva.82.044901
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发表时间：
2010
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;M. Murakami;N. Sakamoto;S. Ishii;K. Sasa;T. Kaneko;H. Kudo
我们精确地测量了动能为0.5 MeV/原子的碳团簇离子C{subn}{sup+}的能量损失。团簇离子在薄碳箔中损失的能量低于等速度原子离子的能量损失[{Delta}E(C{subn}{sup+})/n<；{Delta}E(C{sup+})]，而大多数现有的实验结果显示出相反的趋势，动能高于2.0 MeV/原子。考虑了库仑力、极化力和团簇平均电荷减少对固体响应的影响，将实验值与计算值进行了比较。测量和计算的能量损失之间的一致性表明，能量损失的减少是由于团簇通过过程中电子激发的结构关联所致。
We have precisely measured the energy loss of carbon cluster ions C{sub n}{sup +} with a kinetic energy of 0.5 MeV/atom. The measured energies, lost in a thin carbon foil by cluster ions, are lower than that of an atomic ion with the equivalent speed [{Delta}E(C{sub n}{sup +})/n<{Delta}E(C{sup +})], whereas most existing experimental results show the opposite trend with kinetic energies higher than 2.0 MeV/atom. The experimental values are compared with the calculated ones, which take into account the effect of the Coulomb force, polarization force, and reduction in the cluster average charge on the response of a solid. The agreement between the measured and calculated energy losses indicates that the reduction in the energy loss is due to a structural correlation in electron excitation during the passage of the cluster.