期刊
MOLECULAR PHYSICS
卷 108, 期 7-9, 页码 1241-1251出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/00268976.2010.483133
关键词
high-order harmonic generation; above threshold ionization; time-resolved velocity map imaging
资金
- U.S. Department of Energy [DE-AC02-05CH11231]
Time-resolved anisotropy parameters and cross-section ratios of the positive and negative sidebands from two-colour two-photon above threshold ionization of helium atoms are measured using photoelectron velocity map imaging with the selected 19th high-order harmonic at 29.1 eV in an 810 nm perturbative dressing field. The intensities of both the sidebands and the single-photon ionization depletion follow a Gaussian correlation function where the photoelectron angular distributions and cross-section ratios of the sidebands do not change as a function of the temporal delay between the extreme ultraviolet and infrared pulses. The experimental results are compared with theoretical predictions using the soft-photon approximation, showing poor agreement, and analytical expressions are derived using second-order perturbation theory to determine the relative magnitudes of the resulting S and D partial waves of the above threshold ionization features.
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