POSITRON STATES ON THE CS/CU(100) SURFACE

被引:23
作者
KOYMEN, AR [1 ]
LEE, KH [1 ]
MEHL, D [1 ]
WEISS, A [1 ]
JENSEN, KO [1 ]
机构
[1] UNIV E ANGLIA,SCH MATH & PHYS,NORWICH NR4 7TJ,NORFOLK,ENGLAND
关键词
D O I
10.1103/PhysRevLett.68.2378
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The attenuation of the Cu M2,3VV Auger peak with Cs coverage on Cu(100) was measured using positron-annihilation-induced Auger electron spectroscopy (PAES) and conventional (electron-induced) Auger electron spectroscopy. The data (obtained at both 303 and 163 K) indicate that below a critical coverage (approximately 0.7 monolayer) the positrons are trapped at the Cu/Cs interface in agreement with theoretical calculations. We observe a sharp (less than 0.02 monolayer wide) drop in the normalized PAES intensity at the critical coverage indicating a transition to another positron state in which the positrons are localized on the vacuum side of the Cs overlayer.
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页码:2378 / 2381
页数:4
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