Apparent velocity threshold in the electronic stopping of slow hydrogen ions in LiF

被引：50
|
作者：
Draxler, M
Chenakin, SP
Markin, SN
Bauer, P
机构：
[1] Johannes Kepler Univ Linz, Inst Expt Phys, A-4040 Linz, Austria
[2] Natl Acad Sci Ukraine, Inst Met Phys, UA-03680 Kiev, Ukraine
来源：
PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 11期
关键词：
D O I：
10.1103/PhysRevLett.95.113201
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The electronic energy loss of hydrogen ions (protons and deuterons) in thin supported films of LiF has been studied in backscattering geometry for specific energies from 700 eV/u to 700 keV/u, using Rutherford backscattering spectroscopy and time-of-flight low-energy ion scattering spectroscopy. For specific energies below 8 keV/u, our data confirm velocity proportionality for the stopping cross section epsilon (like in a metal) down to 3.8 keV/u, as observed previously for protons and antiprotons despite the large band gap (14 eV) of LiF. Below 3.8 keV/u, the present results indicate an apparent velocity threshold at about 0.1 a.u. for the onset of electronic stopping.
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页数：4
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