The Influence of the Effective Ionization Potential and Initial Momentum on the Barrier-Suppression Ionization Rate in a Circularly Polarized Laser Field.

Barrier suppression ionization rate for noble gases is analyzed considering the initial momentum of the ejected photoelectron and the influence of the ponderomotive and the Stark shifts on the ionization potential, for a low-frequency, circularly polarized laser field. In order to accomplish it, three different approaches are used: a critical field, an ion charge, and the Airy function. The results are compared across the approaches used and with the other theoretical and experimental results. Good agreement is found. The research shows that the ponderomotive potential and the Stark shift affect the rate differently in these approaches, while the initial momentum of the ejected photoelectron significantly influences the ionization rate regardless of the approach. [ABSTRACT FROM AUTHOR]