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Bremsstrahlung soft X-ray emission from clusters heated by a Gaussian laser beam

Published online by Cambridge University Press:  29 October 2013

Manoj Kumar ,
Rohtash Singh  and
Updesh Verma
Manoj Kumar*
Affiliation:
Physics Department, Indian Institute of Technology Delhi, New Delhi, India
Rohtash Singh
Affiliation:
Physics Department, Indian Institute of Technology Delhi, New Delhi, India
Updesh Verma
Affiliation:
Physics Department, Govt. Degree College Bilaspur, Rampur, Uttar Pradesh, India
*
Address correspondence and reprint requests to: Manoj Kumar, Physics Department, Indian Institute of Technology Delhi, New Delhi-110016, India. E-mail: manojailum@gmail.com
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Abstract

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 ωpe decreases. When plasma frequency of a cluster approaches plasma resonance ${\rm \omega}_{\,pe} = \sqrt{3} {\rm \omega}$ (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.

Keywords

Atomic clusterBremsstralungLaserX-ray emission
Type
Research Article
Information
Laser and Particle Beams , Volume 32 , Issue 1 , March 2014 , pp. 9 - 14
Copyright
Copyright © Cambridge University Press 2013 

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