Ellipticity-dependent ionization yield for noble atoms*

Abstract

The photoionization in the frame of the Ammosov–Delone–Krainov theory has been theoretically examined for noble gases, argon, krypton, and xenon, in an elliptically polarized laser field. We consider the intermediate range of the Keldysh parameter, γ ∼ 1 , and analyze the influence of shifted ionization potential and temporal profile to eliminate disagreement between theoretical and experimental findings. By including these effects in the ionization rates, we solve rate equations in order to determine an expression for the ionization yield. The use of modified ionization potential shows that the ionization yields will actually decrease below the values predicted by original (uncorrected) formulas. This paper will discuss the causes of this discrepancy.

Wavelength- and ellipticity-dependent photoelectron spectra from multiphoton ionization of atoms

“…We can see that the photoelectron yield from resonance-enhanced ionization via the 4s state decreases significantly with the increase of the ellipticity, whereas the yield from resonance-enhanced ionization via the 4d state increases with the increase of the ellipticity. To understand the abnormal ellipticity dependence of the electron yield for the resonant ionization via the 4d state, [41] we show in Fig. 3(b) the normalized population of the 4s and 4d states at the end of the laser pulse from the TDSE result.…”