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Hotter electrons and ions from nano-structured surfaces

Published online by Cambridge University Press:  06 May 2008

S. Bagchi ,
P. Prem Kiran ,
M.K. Bhuyan ,
S. Bose ,
P. Ayyub ,
M. Krishnamurthy  and
G. Ravindra Kumar
S. Bagchi
Affiliation:
Tata Institute of Fundamental Research, Colaba, Mumbai, India
P. Prem Kiran
Affiliation:
Tata Institute of Fundamental Research, Colaba, Mumbai, India
M.K. Bhuyan
Affiliation:
Tata Institute of Fundamental Research, Colaba, Mumbai, India
S. Bose
Affiliation:
Tata Institute of Fundamental Research, Colaba, Mumbai, India
P. Ayyub
Affiliation:
Tata Institute of Fundamental Research, Colaba, Mumbai, India
M. Krishnamurthy
Affiliation:
Tata Institute of Fundamental Research, Colaba, Mumbai, India
G. Ravindra Kumar*
Affiliation:
Tata Institute of Fundamental Research, Colaba, Mumbai, India
*
Address correspondence and reprint requests to: G. Ravindra Kumar: Tata Institute of Fundamental Research, 1 Homi Bhabha Road, Colaba, Mumbai-400005, India. E-mail: grk@tifr.res.in
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Abstract

The impact of nano-structured surfaces on particle generation from ultrashort intense laser produced plasmas is presented over an intensity range of 1015–1017 Wcm−2. The nano-structured surface evidently produces hotter plasma but does not lead to the generation of hotter ions, a counterintuitive result based on present understanding of plasma expansion mechanism. Although the total ion flux and energy is more in the case of structured surfaces, the average energy of the projectiles is found to be lower than that from polished surfaces. The nano-structured surface shows preferential enhancement of lower energy ions and an intensity dependent divergence of the ejected particles.

Keywords

Bremsstrahlung radiationEnergetic ion emissionIntense laser-produced plasmaNano-structured surfaces
Type
Research Article
Information
Laser and Particle Beams , Volume 26 , Issue 2 , June 2008 , pp. 259 - 264
Copyright
Copyright © Cambridge University Press 2008

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