期刊
JOURNAL OF PHYSICAL CHEMISTRY A
卷 113, 期 47, 页码 13152-13158出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp903231n
关键词
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资金
- Office of Science, Office of Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division, U.S. Department of Energy [DE-AC02-05CH11231]
- National Science Foundation Engineering Research Center, Extreme Ultraviolet Science and Technology [EEC-0310717]
- Weizmann Institute of Science
Anisotropy parameters and cross section ratios of two-color two-photon above threshold ionization sidebands from argon are measured using photoelectron velocity map imaging with the selected 13th or 15th high-order harmonics in a perturbative 800 nm dressing field. A new data analysis technique determines accurate anisotropy parameters of the photoelectron angular distributions for each sideband by subtracting a sequence of percentages of the single-photon ionization background from the above threshold ionization signal to correct for the angular averaging of overlapping photoelectron energies. The results provide a fundamental test of theoretical predictions based on second-order perturbation theory with a one-electron model and the soft-photon approximation and show agreement with theory for the cross section ratios. However, discrepancies between the theoretically predicted and experimentally determined photoelectron angular distributions demonstrate the need for a more comprehensive theoretical description of two-color two-photon above threshold ionization.
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