HOT TUNGSTEN CLUSTERS - COMPETITION BETWEEN ATOM EJECTION AND THERMIONIC EMISSION

被引:47
作者
LEISNER, T
ATHANASSENAS, K
ECHT, O
KANDLER, O
KREISLE, D
RECKNAGEL, E
机构
[1] Fakultät für Physik, Universität Konstanz, Konstanz, W-7750
来源
ZEITSCHRIFT FUR PHYSIK D-ATOMS MOLECULES AND CLUSTERS | 1991年 / 20卷 / 1-4期
关键词
D O I
10.1007/BF01543954
中图分类号
O64 [物理化学(理论化学)、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号
070203 ; 070304 ; 081704 ; 1406 ;
摘要
This is a first report concerning the thermionic emission of electrons from hot metal clusters. Tungsten clusters were exposed to a 10 ns laser pulse, and the delayed emission of electrons from the clusters was recorded as a function of time after the excitation. A large yield of W(n)+ cluster ions, which were born as late as microseconds after the laser pulse, has been detected for n > 4. Tungsten cluster ions created via thermionic emission show no measurable metastable decay during the flight time in the mass spectrometer. This indicates that they are colder than expected, if evaporative cooling after prompt ionization would prevail.
引用
收藏
页码:127 / 129
页数:3
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