Study on the energy-loss mechanism of fast neutral particles at crystal surfaces

快中性粒子晶体表面能量损失机制研究

• 批准号: 06452070
• 负责人: MANNAMI Michihiko
• 金额: $ 4.54万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06452070/
• 关键词: Fast neutral particle; Time of flight; Surface scattering; Energy loss; Electron density

A time of flight (TOF) system was developed to measure energy of fast neutral particles. Using this TOF system, energy losses of reflected particles, both ions and neutral atoms, were measured at glancing angle incidence of 12 - 30 keV rare gas ions on the (001) surface of SnTe single crystal. The observed neutral fractions were larger than 96% and the observed energy losses of the reflected ions were almost equal to those of the neutral particles. These experimental results indicate that almost all incident ions were neutralized at the surface. The position dependent stopping powers for neutral rare gas atoms were derived from the observed incident-angle dependence of the energy loss. The obtained stopping power was successfully explained in terms of single collisions of neutral atom with valence electrons permeated outside the surface. A new method to determine the electron ditsribution outside a crystal surface was proposed.

研制了一套用于测量快中性粒子能量的飞行时间测量系统。利用该飞行时间系统，测量了12 - 30 keV稀有气体离子掠入射SnTe单晶（001）面时，离子和中性原子反射粒子的能量损失。所观察到的中性分数大于96%，所观察到的反射离子的能量损失几乎等于中性粒子的能量损失。这些实验结果表明，几乎所有的入射离子在表面被中和。从观察到的能量损失随入射角的变化关系出发，导出了中性稀有气体原子的位置相关阻止本领。用中性原子与渗透到表面外的价电子的单次碰撞成功地解释了所得到的阻止本领。提出了一种测定晶体表面外电子分布的新方法。

项目成果

Kenji Kimura: "Energy loss straggling of 0.5-MeV protons specularly reflected from a SnTe(001) surface" Nucl. Instr. and Meth. in Phys. Res.B100. 356-360 (1995)

Kenji Kimura：“从 SnTe(001) 表面镜面反射的 0.5 MeV 质子的能量损失”Nucl。

Y.Susuki: "Dissociative scattering of fast HeH^+ ions at glancing-angle incidence on a crystal surface" Physical Review A. 51. 528-534 (1995)

Y.Susuki：“快速 HeH^ 离子在晶体表面上的掠射角入射时的解离散射”物理评论 A. 51. 528-534 (1995)

Kenji Kimura: "Energy loss straggling of 0.5-MeV protons specularly reflected from a SnTe (001) surface" Nucl.Instr.and Meth.in Phys.Res.Vol.B 100. 356-360 (1995)

Kenji Kimura：“从 SnTe (001) 表面镜面反射的 0.5 MeV 质子的能量损失离散” Nucl.Instr.and Meth.in Phys.Res.Vol.B 100. 356-360 (1995)

Y.Susuki: "Dissociative scattering of fast HeH^+ ions at glancing-anle incidence on a crystal surface" Physical Review A. Vol.51. 528-534 (1995)

Y.Susuki：“晶体表面上掠射角入射时快速 HeH^ 离子的解离散射”物理评论 A. 第 51 卷。

M. Mannami: "Charge-state dependence of energy losses of 3.2 MeV Li ions specularly reflected from surface of single crystal" Nucl. Instr. and Meth. in Phys. Res.B100. 1-9 (1995)

M. Mannami：“从单晶表面镜面反射的 3.2 MeV Li 离子能量损失的电荷态依赖性”Nucl。