Stabilization of an atom with two autoionizing states in a strong resonance electromagnetic field

A. D. Gazazyan, Razmik G. Unanyan

Alexander B Voitkiv

Alexander B Voitkiv

V A Pazdzersky, V I Usachenko, Alexander B Voitkiv

Resonance electron-positive ion scattering in the presence of a strong electromagnetic field at an initial energy of colliding particles close to the energy of their autoionizing state and a field frequency resonant to the frequency of the transition between autoionizing and Rydberg states of the system was investigated. The resulting cross sections for elastic and inelastic scattering (accompanied by forced absorption of a photon) exhibit a pronounced resonance structure, strongly dependent on the electromagnetic field parameters and those of the electron-ion system under consideration.

Natalia E. Karapanagioti, O. Faucher, Cornelis J. G. J. Uiterwaal +4 more

The coherent resonant coupling of two autoionizing states of magnesium by an intense electromagnetic field is investigated experimentally by means of ionization and energy-selected photoelectron spectra probed from the ground state of the atom. The resulting effect of a drastic reduction in the ionization of the system is interpreted as the splitting of the two states achieved through their mixing by the field. A complete theoretical treatment of the problem employing the density matrix formalism is presented, reproducing the effects observed and explaining the phenomenon in terms of the relative populations of the states in the system.