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Effect of electron correlation on high-order-harmonic generation of helium atoms in intense laser fields: Time-dependent generalized pseudospectral approach in hyperspherical coordinates
Chu, Shih-I Tong, Xiao-Min Guan, Xiaoxu
Chu, Shih-I
Tong, Xiao-Min
Guan, Xiaoxu
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Abstract
We present a time-dependent generalized pseudospectral (TDGPS) approach in hyperspherical coordinates for fully ab initio nonperturbative treatment of multiphoton dynamics of atomic systems in intense laser fields. The procedure is applied to the investigation of high-order-harmonic generation (HHG) of helium atoms in ultrashort laser pulses at a KrF wavelength of 248.6nm. The six-dimensional coupled hyperspherical-adiabatic-channel equations are discretized and solved efficiently and accurately by means of the TDGPS method. The effects of electron correlation and doubly excited states on HHG are explored in detail. A HHG peak with Fano line profile is identified which can be attributed to a broad resonance of doubly excited states. Comparison of the HHG spectra of the ab initio two-electron and the single-active-electron model calculations is also presented.
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This is the published version, also available here: http://dx.doi.org/10.1103/PhysRevA.73.023403.
Date
2006-02-02
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American Physical Society
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ChuShih-I_2-2-2006.pdf
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Chu, Shih-I., Tong, Xiao-Min., Guan, Xiaoxu. "Effect of electron correlation on high-order-harmonic generation of helium atoms in intense laser fields: Time-dependent generalized pseudospectral approach in hyperspherical coordinates." Phys. Rev. A 73, 023403 – Published 2 February 2006. http://dx.doi.org/10.1103/PhysRevA.73.023403.