Strong-field autoionization by smooth laser pulses

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Abstract
We consider pulses of coherent electromagnetic radiation impinging upon an autoionizing atom. Analytic solutions in the cases of hyperbolic-secant- and exponential-pulse envelopes are given for the ground-state atomic population and for the photoelectron spectrum. The sensitivity of these quantities to the pulse area and to the interference between the autoionizing state and the continuum is studied.