Delayed electron emission of negatively charged tungsten clusters

被引：18

作者：

Weidele, H ^{[1
]}

Becker, S ^{[1
]}

Kluge, HJ ^{[1
]}

Lindinger, M ^{[1
]}

Schweikhard, L ^{[1
]}

Walther, C ^{[1
]}

Ziegler, J ^{[1
]}

Kreisle, D ^{[1
]}

机构：

[1] UNIV MAINZ,INST PHYS,D-55099 MAINZ,GERMANY

来源：

SURFACE REVIEW AND LETTERS | 1996年 / 3卷 / 01期

关键词：

D O I：

10.1142/S0218625X9600098X

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The delayed electron emission of negatively charged tungsten clusters has been investigated on a time scale from 1 to 500 ms. After being stored in a Penning trap clusters ions W-n(-) (4 less than or equal to n less than or equal to 14, 18 less than or equal to n less than or equal to 20) were heated via multiphoton absorption (hv = 1.81 eV). In contrast to alkali and coinage metals no photofragmentation could be detected. Instead, for all cluster sixes studied so far only a decrease in the initial ion intensity as a function of time after excitation was observed. This decrease is not caused by ion loss from the trap, but has to be attributed to neutralization via delayed electron emission. The presented results strongly suggest that this process can be viewed as ''thermionic emission'' known from bulk-metal surfaces.

引用

页码：541 / 544

页数：4

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