Quasienergy spectrum of complex atoms.

Abstract

Representative sections of the quasienergy spectrum of argon and of alkali-metal atoms are presented for wavelengths between 250 nm and 800 nm and excursion amplitudes up to α0=20 a.u. The variation of the quasienergy spectrum with the wavelength of the laser field is discussed. It is shown that large-scale changes in its topology arise from laser-induced degeneracies with states without physical high-intensity or low-intensity limits.