Abstract
A time-dependent close-coupling method is used to calculate the multiphoton double ionization of He using a combination of ultraviolet and infrared laser pulses. Total probabilities for the two photon double ionization of He using a laser pulse at 42 eV and 1014 W cm−2 are compared with those in the presence of an additional laser pulse at 1.5 eV and a variety of intensities. Momentum space wavefunction densities calculated for the multiphoton double ionization of He at 42 eV and 1014 W cm−2 are compared with those in the presence of additional laser pulse at 1.5 eV and 1012 W cm−2. Single and triple differential probabilities for the two and three photon double ionization of He using a laser pulse at 42 eV and 1014 W cm−2 are compared with those in the presence of an additional laser pulse at 1.5 eV and 1012 W cm−2.
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