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Physical Review A

Continuum-interference mechanism of strong-field atomic stabilization

Olga V. Tikhonova, A. M. Popov, Mikhail Vladimirovich Fedorov

Published Apr 17, 2002• 17 citations
Publisher

Abstract

A mechanism of strong-field continuum-interference stabilization of atoms is proposed. Stabilization is assumed to arise owing to interference of different-order continuum-continuum and bound-continuum transitions. In the framework of perturbation theory the threshold of stabilization is estimated qualitatively, and the estimates are shown to be in a reasonably good agreement with existing experimental data and the results of numerical simulations. The considered mechanism clarifies the physics of adiabatic stabilization at ${\ensuremath{\alpha}}_{0}{/a}_{\mathrm{at}}<1.$

DOI
10.1103/physreva.65.053404

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A mechanism of strong-field continuum-interference stabilization of atoms is proposed. Stabilization is assumed to arise owing to interference of different-order continuum-continuum and bound-continuum transitions. In the framework of perturbation theory the threshold of stabilization is estimated qualitatively, and the estimates are shown to be in a reasonably good agreement with existing experimental data and the results of numerical simulations. The considered mechanism clarifies the physics of adiabatic stabilization at \ensuremathα0/aat<1.{\ensuremath{\alpha}}_{0}{/a}_{\mathrm{at}}<1.\ensuremathα0​/aat​<1.
Interference stabilization of atoms is investigated numerically. Raman-type transitions to Rydberg states with higher values of the electron orbital momentum are taken into account. These transitions are shown to change qualitatively theoretical predictions concerning the dependence of the time of ionization on the light-field-strength amplitude : if the weak-field time of ionization, as usual, is a falling function of , in a strong-field region the function is predicted to be more or less constant and of the order of the classical Kepler period in a rather large interval of , in contrast with the earlier prediction according to which, in a strong field, was assumed to be a rather fast growing function. The results derived are shown to be in a rather good agreement with the existing experiments. Alternative theoretical models are discussed.
Interference stabilization of atoms is discussed. Raman-type transitions to Rydberg states with higher values of the electron orbital momentum l are taken into account in numerical calculations. These transitions are shown to change qualitatively theoretical predictions concerning the dependence of the time of ionization ti on the light field-strength amplitude (epsilon) 0: the time of ionization is shown to be a falling function of (epsilon) 0 in the weak-field region and, then, in a rather large interval of (epsilon) 0, to be approximately constant. The results derived are shown to be in a rather good agreement with the existing experiments.© (1996) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
The main ideas and features of strong-field interference stabilization of Rydberg atoms are described. Both analytical and model calculations, as well as exact numerical solutions of the Schördinger equation are discussed and compared with each other. Experiments of the FOM Institute groups (The Netherlands) on stabilization of Ba and Ne atoms excited initially, correspondingly, to 27d and 5g levels are discussed. In both cases mechanisms of stabilization are argued in favor of different kinds of interference phenomena rather than adiabatic stabilization.
Photoionization of highly excited atoms by a strong microwave field is considered. Secondary coherent population of some neighboring Rydberg levels in the process of ionization is shown to be a reason for interference of transitions from these levels to the continuum. Interference is shown to be a reason for some new effects: stabilization of the atom, suppression of its ionization, appearance of a multipeak structure in the photoelectron spectrum, field-induced narrowing of its peaks, narrowing and localization of quasi-energy atomic spectrum in a strong field, etc.
We present an atomic model to study above-threshold ionization (ATI). We show that when the laser field is sufficiently intense the usual perturbation theory is not valid. We solve the model dynamics exactly, and several interesting quantities, including the initial-state decay rate and photoelectron spectrum, are calculated. These quantities are related to recent ATI experiments, and qualitatively they agree with these experiments. We specify the strong-field condition for continuum–continuum transitions and explore its physical meaning. Finally some comments on perturbation theory are made.
Excitation and photoionization of Rydberg wave packets are described. Interference of bound-free transitions from many coherently populated Rydberg levels is shown to affect the dependence of the photoionization probability on the duration of interaction. Strong-field interference effects in such a system are described also. The most important of these is the field-induced interference stabilization of Rydberg atoms in a strong ionizing field. The intensity range in which this effect can exist is determined. The results derived are used for a qualitative model describing supercontinuum emission in the process of multiphoton ionization.