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AIP conference proceedings

New field ionizer for fast Rydberg atoms

Sergei A. Aseyev, Yu. A. Kudryavtsev, D. V. Laryushin, Vladilen S Letokhov, V. V. Petrunin

Published Jan 1, 1995• 1 citation
Publisher

Abstract

New type of field ionizer for fast Rydberg atoms based on permanent magnetic field is developed. As distinct from electric field ionization, the ions and electrons resulting from ionization in magnetic field conserve their kinetic energies. This property can be very useful for RIS applications.
DOI
10.1063/1.47602

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We showed that there are two main processes that produce the collisional background in the method of the collinear laser photoionization of fast atoms. The first process is the ionization of fast atoms and the second one is the collisional excitation of fast atoms into Rydberg states.The first experimental results on Rydberg states formation cross sections in atomic collisions were obtained. For the first time it has been experimentally obtained such cross sections scaled as n−3.To reduce the collisional noise the use of fast Rydberg atoms ionization in permanent magnetic field is proposed.
Rydberg molecule, formed by one or more Rydberg atoms, exhibits remarkable properties, including an exceptionally large spatial extent, rich rovibrational level structures, permanent electric dipole moments, and a pronounced sensitivity to external fields. Based on the underlying binding mechanisms, Rydberg molecules can be divided into three categories, the ground-Rydberg molecule that is bound via a low-energy electron-atom scattering interaction between ground atom and Rydberg electron, the Rydberg-Rydberg molecule that is bound via a long-range electrostatic interaction between Rydberg atoms, and the ion-Rydberg molecule that is bound via single- or multi-polar interactions between Rydberg atom and ion. This review focuses on recent theoretical and experimental advances in diatomic Rydberg molecules, covering their formation and binding mechanisms, potential energy curves, experimental observations, and spectroscopic properties, with the aim of providing a comprehensive overview of the current state and future prospects of this rapidly developing field.
The outer electron of a Rydberg atom is so weakly bound to the atomic core that a relatively small electric field may cause the electron to be stripped from the atom. The field strength at which this ionization happens is strongly dependent on the state of the Rydberg atom. Pulsed electric field ionization serves, therefore, not only as a means by which a Rydberg atom may be efficiently detected, but also a means by which the state of the Rydberg atom may be analyzed.\nThe first observation of predominantly diabatic passage to field ionization of a non-hydrogenic Rydberg atom has resulted in an improved understanding of the adiabatic and diabatic ionization processes. The magnitudes of the various field ionization features have been measured and found to agree with theory, and by detailed analysis, it is now possible to label the various field ionization signal features with the appropriate (VBAR)m(,l)(VBAR) quantum numbers. A much better understanding of the laser excitation process, the Rydberg state production, and the response of the excited state to an increasing electric field has enabled measurement of some Rydberg fine-structure intervals, through observation of field ionization quantum beats.
Molecular-dynamics simulations have been performed for frozen Rydberg gases in a strong magnetic field of B = 2.9 T, up to a microsecond time scale. We found that a small number of spontaneously ionized electrons may de-excite a large portion of Rydberg atoms, while the free electrons leave the frozen Rydberg gases along the B-field. Such de-excitations as well as Rydberg–Rydberg atom interactions can induce significant heating to strongly magnetized Rydberg gases. Kinetic energy increase by 2–3 orders of magnitude has been observed for the initially frozen (~0.2 mK) Rydberg gases.