Role of particle charge in impact ionization by charged microparticles

被引:14
作者
Burchell, MJ [1 ]
Cole, MJ [1 ]
McDonnell, JAM [1 ]
机构
[1] Univ Kent, Dept Phys Sci, Unit Space Sci & Astrophys, Canterbury CT2 7NR, Kent, England
关键词
hypervelocity; impact; ionization;
D O I
10.1016/S0168-583X(98)00371-1
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
The role of particle charge in generating ionization of projectile and target in impacts of iron microparticles on copper has been investigated at impact velocities above 1 km s(-1). Charged microparticles are accelerated in an electrostatic accelerator and their surface charge subsequently reduced in flight by passage through a thin conducting film. It is found that a reduction in projectile charge of 80% at 5 km s(-1) reduces noticeably the degree of impact ionization. This supports the recent assertion that heating due to current flow between the particle and target immediately prior to impact may play a significant role in impact ionization at such velocities. (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:311 / 318
页数:8
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