Abstract
We present a coupled-channel calculation of two-photon single ionization of helium by a superposition of the 7th to the 13th harmonic of a Ti:sapphire laser. Solving the time-dependent two-electron Schrodinger equation with a coherent polychromatic field, the single-ionization probabilities are calculated. Besides Slater-like orbitals we use regular Coulomb wavepackets in our configurational interaction basis to describe the single- and double-electron continuum. Linearly polarized laser pulses are used in the length gauge within the dipole approximation. We applied cosines squared normalized envelope functions. The pulse intensity is varied between 109 and 1012 W/cm2, the total duration of each harmonics is between 36–49 femtoseconds. Our results are compared to other ab initio calculations, the possible reasons of the discrepancies are discussed.
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