Twin peak distribution of electron emission profile and impact ionization of ambient molecules during laser ablation of silver target

被引:40
作者
Issac, RC [1 ]
Gopinath, P [1 ]
Varier, GK [1 ]
Nampoori, VPN [1 ]
Vallabhan, CPG [1 ]
机构
[1] Cochin Univ Sci & Technol, Laser Div, Int Sch Photon, Cochin 682022, Kerala, India
关键词
D O I
10.1063/1.121743
中图分类号
O59 [应用物理学];
学科分类号
摘要
Laser-induced plasma generated from a silver target under partial vacuum conditions using the fundamental output of nanosecond duration from a pulsed Nd:yttrium aluminum garnet laser is studied using a Langmuir probe. The time of flight measurements show a clear twin peak distribution in the temporal profile of electron emission. The first peak has almost the same duration as the laser pulse while the second lasts for several microseconds. The prompt electrons are energetic enough (approximate to 60 eV) to ionize the ambient gas molecules or atoms. The use of prompt electron pulses as sources for electron impact excitation is demonstrated by taking nitrogen, carbon dioxide, and argon as ambient gases. (C) 1998 American Institute of Physics.
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页码:163 / 165
页数:3
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