Quantum trajectory perspective of atom–field interaction in attosecond time scale
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The ionization and high-harmonic generation in hydrogen and helium by using quantum (hydrodynamic) trajectories is analyzed theoretically. The quantum trajectories are introduced in the frame of a new time-dependent quantum Monte Carlo technique that allows a self-contained ab initio treatment of the electron correlation effects without introducing parametrized correlation potentials into the Schrödinger equation. Our approach predicts correct ionization, high-harmonic spectra, and attosecond pulses generated by a helium atom beyond the single active electron approximation. It can be used to study complex multi-electron systems in arbitrary dimensions and their interaction with laser fields of both low and high intensity.
KeywordsHelium Atom Harmonic Spectrum Outer Electron Attosecond Pulse Quantum Trajectory
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- 2.K. Kulander, K. Schafer, J. Krause, in Atoms in Intense Laser Fields, ed. by M. Gavrila (Academic, New York, 1992), pp. 247–300Google Scholar