ANGULAR-DEPENDENCE OF THE DOPPLER BROADENING IN THE RESONANCE OF THE H-1(N-15,ALPHA-GAMMA)C-12 REACTION

被引：5
|
作者：
IWATA, Y
机构：
[1] Electrotechnical Laboratory, Tsukuba-shi, Ibaraki, 305, Umezono
来源：
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 1991年 / 56-7卷
关键词：
D O I：
10.1016/0168-583X(91)96072-S
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
We provide the first direct demonstration of the three-dimensional vibrational motion of hydrogen monoatomically chemisorbed at the bridge sites on a well defined W(001) surface in beta-1 phase, by the Doppler broadening in the narrow resonance of the H-1(15H, alpha-gamma)C-12 (E(res) = 6.385 MeV) reaction. The beam-incident angle (theta) dependence of the Doppler width shows that the mean square of momentum <p2> of vibrating hydrogen on the surface takes the maximum at theta = 15-degrees. We propose a possible model that the bridge plane leans away from the axis perpendicular to the surface due to the interaction between the hydrogen atoms opposite to each other.
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页码：469 / 472
页数：4
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