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AIP conference proceedings

Interference Stabilization in Atoms and Molecules

Mikhail Vladimirovich Fedorov

Published Jan 1, 2002• 1 citation
Publisher

Abstract

The existing theoretical and experimental works on interference stabilization of Rydberg atoms are overviewed. Physical origin of the phenomenon, its main features and the conditions of existence, as well as the main theoretical approaches used for its description are discussed. These ideas are used to describe interference stabilization of molecules with respect to photodissociation. Specific calculations are carried out for the hydrogen molecular ion H2+. The main features of strong‐field photodissociation are described. The conditions of stabilization and destabilization of a molecule are found and related to features of the initial‐state molecular vibrational wave function.

DOI
10.1063/1.1514264

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The existing theoretical and experimental works on interference stabilization of Rydberg atoms are overviewed. Physical origin of the phenomenon, its main features and the conditions of existence, as well as the main theoretical approaches used for its description are discussed. These ideas are used to describe interference stabilization of molecules with respect to photodissociation. Specific calculations are carried out for the hydrogen molecular ion H2+. The main features of strong‐field photodissociation are described. The conditions of stabilization and destabilization of a molecule are found and related to features of the initial‐state molecular vibrational wave function.
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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 Rydberg atoms is considered in the framework of the quasiclassical (WKB) approach. Distribution of the photoelectron density in space and time is found and analyzed. This distribution is shown to consist of two main parts: the temporary population, which exists only as long as the light field is on; and the population corresponding to irreversible ionization. The irreversible-ionization wave packets are shown to experience the effect referred to as Coulomb narrowing. An origin of this effect and the conditions of its existence are discussed. In a strong field, rather simple analytical expressions are found for the partial probabilities of above-threshold ionization and for the total probability of ionization. In contrast to many earlier works, in the present theory neither the rotating-wave nor ``pole'' approximations are used, and the results are derived for an arbitrary pulse shape. Strong-field interference stabilization of Rydberg atoms is confirmed to occur at pulse durations shorter than the Kepler period. The arising regimes of interference stabilization are analyzed in comparison with the predictions of earlier works.
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.
We examine the suppression of 1+1 photodissociation or photoionization by laser fields. We find that atoms and molecules become more stable against photoionization or photodissociation when the intensity of the nonresonant laser field is increased above a limiting value for a two level plus continuum model system. We treat the ionization or dissociation dynamics analytically and discuss the conditions for optimum yields in a two-frequency square pulse laser field. We observe similar suppression against photodissociation for realistic sine-squared laser pulses. We demonstrate such a type of molecular suppression for 1+1 photodissociation of H2.