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

R. C. Issac | Zendy; Pramod Gopinath | Zendy; Geetha K. Varier | Zendy; V. P. N. Nampoori | Zendy; C. P. G. Vallabhan | Zendy

Open Access

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

Author(s) -

R. C. Issac,

Pramod Gopinath,

Geetha K. Varier,

V. P. N. Nampoori,

C. P. G. Vallabhan

Publication year - 1998

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.121743

Subject(s) - ionization , atomic physics , langmuir probe , laser , nanosecond , argon , plasma , laser ablation , electron , yttrium , pulse duration , materials science , microsecond , electron ionization , chemistry , plasma diagnostics , optics , ion , oxide , physics , quantum mechanics , metallurgy , organic chemistry

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 (≈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.

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