Study of Asymmetric Electron Emission in Two-Color Ionization of Helium (XUV–IR)
In this work, we focused on the angular photoelectron emission from helium generated by an Attosecond Pulse Train (APT) in the presence of a weak Infrared (IR) field. The APT creates both an excited and a continuum electron wave packets. By ionizing the excited state with the IR pulse, a delayed new continuum electron wave packet is created. Consequently, a mix of energy-degenerate even and odd parity states is fed in the continuum by one- and two-photon transitions. These interfere, leading to an asymmetric electron emission along the polarization vector. The interference can be controlled by varying the time delay between the APT and IR pulses.
KeywordsElectron Wave Packet Barium Borate 15th Harmonic Attosecond Pulse Train Beta Barium Borate
We are very grateful to C. D. Lin for bringing this study to our attention and for the illuminating discussions. This work was supported by the U.S. Army Research Office under Grant No. W911NF-071-0475, by Chemical Sciences, Geosciences and Biosciences Division, Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy, and by the National Science Foundation under Grant No. CHE-0822646.
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