A theoretical study of the high-order harmonics of a 200 nm laser from H2 and HeH+

Dey, Bijoy Kr. ; Deb, B. M. (1997) A theoretical study of the high-order harmonics of a 200 nm laser from H2 and HeH+ Chemical Physics Letters, 276 (1-2). pp. 157-163. ISSN 0009-2614

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S00092...

Related URL: http://dx.doi.org/10.1016/S0009-2614(97)88050-5

Abstract

Using a time-dependent quantum mechanical method, based on the evolution of the electron density in real time, a theoretical study is made of the high harmonic generation in H2 and HeH+, corresponding to a 200 nm laser. For H2, four laser intensities in the range 1013-1016 W cm-2 are employed while only one intensity ( ≈ 1016 W cm-2) is employed for HeH+. Up to the 45th order (4.44 nm) harmonic for H2 and the 53rd order (3.77 nm) harmonic in HeH+ are predicted. For H2, increase in laser intensity I does not change the structure of the high harmonic spectrum but increases the yield of each harmonic according to a fractional law of I1.5. Polar molecules/molecular ions might serve as excellent sources for higher harmonics, the yield and order of the harmonic increasing with increasing mass, ionization potential and polarizability.

Item Type:Article
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ID Code:9199
Deposited On:29 Oct 2010 11:23
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