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The yield of neutral excited atoms and low-energy photoelectrons generated bythe electron dynamics in the combined Coulomb and laser field after tunnelingis investigated. We present results of Monte-Carlo simulations built on thetwo-step semiclassical model, as well as analytic estimates and scalingrelations for the population trapping into the Rydberg states. It is shown thatmainly those electrons are captured into bound states of the neutral atom thatdue to their initial conditions (i) have moderate drift momentum imparted bythe laser field and (ii) avoid strong interaction ("hard" collision) with theion. In addition, it is demonstrated that the channel of capture, whenaccounted for in semiclassical calculations, has a pronounced effect on themomentum distribution of electrons with small positive energy. For theparameters that we investigated its presence leads to a dip at zero momentum inthe longitudinal momentum distribution of the ionized electrons.

Capture into Rydberg states and momentum distributions of ionized electrons