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Kumar M.,Indian Institute of Technology Delhi | Singh R.,Indian Institute of Technology Delhi | Verma U.,Government Degree College Bilaspur
Laser and Particle Beams

A theoretical model of soft X-ray emission from laser irradiated clusters is developed. An intense short pulse laser of Gaussian radial and temporal profiles impinged on a clustered gas jet, heats the cluster electrons, leading to Bremsstrahlung emission of X-rays. As the clusters expand under hydrodynamic pressure, plasma frequency of the cluster electrons ω pe decreases. When plasma frequency of a cluster approaches plasma resonance ωpe = √3ω (where ω is the laser frequency), the electrons are resonantly heated by the laser and a rapid rise in X-ray emission occurs. After a while, when cluster expansion detunes the plasma resonance, X-ray emission falls off. © Cambridge University Press, 2013. Source

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