TIME-CORRELATED ION FORMATION IN THE FIELD DESORPTION OF HYDROGEN

被引:9
作者
DIRKS, J
DRACHSEL, W
BLOCK, JH
机构
[1] Fritz-Haber-Institut der Max-Planck-Gesellschaft, W-1000 Berlin-Dahlem
关键词
D O I
10.1016/0039-6028(91)90406-I
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
Time-correlated ion formation is observed in the field ion current of hydrogen from a tungsten emitter. The simultaneous emission of pairs of ions, where each pair contains two of the three possible ions H+, H2+, or H3+, is confirmed by auto- and cross-correlation measurements. From the observed dependence on field strength and hydrogen pressure and supplementary laser induced field desorption experiments we conclude that the time-correlated ion formation is due to electron stimulated field desorption (ESFD). The amount of correlated ions can reach approximately 16% of the total field ion rate for a hydrogen pressure of 10(-5) mbar.
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页码:150 / 156
页数:7
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