NEGATIVE HYDROGEN-ION DENSITIES AND DRIFT VELOCITIES IN A MULTICUSP ION-SOURCE

被引:26
|
作者
EENSHUISTRA, PJ [1 ]
GOCHITASHVILLI, M [1 ]
BECKER, R [1 ]
KLEYN, AW [1 ]
HOPMAN, HJ [1 ]
机构
[1] TBILISI STATE UNIV,DEPT PHYS,TBILISI 380028,GEORGIA,USSR
关键词
D O I
10.1063/1.345210
中图分类号
O59 [应用物理学];
学科分类号
摘要
We have determined densities of negative hydrogen ions in a discharge by a laser detachment technique. We measured the electron density, the electron temperature, and the positive ion density using a Langmuir probe. We also performed extraction measurements. Combination of H- density measurements and extraction measurements yields information about the H - drift velocity. It was found that the velocity scaled with the square root of the electron temperature. All measurements were done as a function of discharge voltage, discharge current, and gas pressure. The densities are compatible with a semiquantitative model in which H- is produced by dissociative attachment of plasma electrons to vibrationally excited molecules and destroyed by wall collisions at very low pressure and collisions with H atoms, positive ions and/or hot thermal electrons at higher pressure.
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页码:85 / 96
页数:12
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