We examine the excitation of continuum-state resonances close to the threshold, paying
particular attention to the breakdown of the Markov approximation and the consequences of …

Second-order and fourth-order intensity-dependent corrections to the energy levels of the
hydrogen atom are calculated. By comparing the results obtained for these two orders and …

The subject of near-threshold strong-field photoionization and photodetachment is reviewed
and presented in a uniform and systematic way. The general formalism of the resolvent is …

We consider the excitation of atomic hydrogen in its ground state by an intense radiation
field tuned close to the ionization threshold. Results are presented for the ac Stark shift of the …

A relatively comprehensive theoretical description of one-color and two-color
photoionization of molecules by strong laser fields is developed. The molecular system is …

We study one-photon resonant two-photon excitation of autoionizing Rydberg series close to
threshold. Analytical expressions for the time evolution of bound-state amplitudes are …

Near-threshold photodetachment in strong laser fields has been discussed in the case of the
presence of an autoionizinglike state in the ionic continuum. The role of a real negative pole …

The features of the photoelectron spectrum in the near-threshold photoionisation of atoms
are investigated in a non-perturbative way both above and below the threshold. It is shown …

We consider near-threshold ionization of atomic hydrogen by strong laser light.
Nonperturbative features of the photoelectron spectrum and double optical resonance …

The dynamics of the ground-state population is investigated for photodetachment of an ionic
model including a ground state and a continuum which is Fano pre-diagonalized due to a …