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Angular momentum in a laser-driven atom

We report unexpected results for the time evolution of the angular momentum distribution in a laser-driven one-electron atom. To interpret these, an analytically soluble model has been developed which yields the time evolution of an initially Gaussian wavepacket in a linearly polarized laser field. Two extreme cases have been examined in detail, namely when the laser field is either very strong or negligible in comparison to the confining potential experienced by the wavepacket. These cases have provided a good qualitative understanding of angular momentum in the true laser-driven atom.