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中国科学通报：英文版

Preliminary experimental study of Rydberg structure of Cs atoms in crossed electric and magnetic fields

顾思洪, 龚顺生, 刘炳模, 王嘉珉, 刘文瑜, 李白文

Published Jan 1, 1995• 0 citations
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Abstract

Due to its academic significance and potential applications, the study of the behavior of Rydberg atoms in external fields has been a topic in the forefront of atomic and molecular physics researches. Efforts are currently concentrated on the situations with the presence of both the electric and the magnetic fields (combined fields). In particular, when the two fields are perpendicular to each other, the potential symmetry is severely destructed and the system becomes very complicated. Previous theoretical studies predicted the exist-

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Highly excited atoms—a homage to Pierre Jacquinot

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Effect of crossed electric and magnetic fields on sodium Rydberg states

Eric J. Korevaar, Michael G. Littman

The excitation spectrum for Rydberg states near n=11 of atomic sodium in crossed electric and magnetic fields has been recorded. The theoretical analysis of the spectroscopic data reveals degeneracies among some sublevels even though different sublevels are mixed by the external fields. The degeneracies are traced to a dynamical symmetry that is characteristic of the Coulomb potential.

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Due to its academic significance and potential applications, the study of the behavior of Rydberg atoms in external fields has been a topic in the forefront of atomic and molecular physics researches. Efforts are currently concentrated on the situations with the presence of both the electric and the magnetic fields (combined fields). In particular, when the two fields are perpendicular to each other, the potential symmetry is severely destructed and the system becomes very complicated. Previous theoretical studies predicted the exist-
In recent years, Rydberg atoms have been the subject of intense study, becoming the testing ground for several quantum mechanical problems. This book provides a comprehensive description of the physics of Rydberg atoms, highlighting their remarkable properties by reference to their behaviour in a wide range of physical situations. Following an overview of the basic properties of Rydberg atoms, their interactions with electric and magnetic fields are analysed in detail. The collisions of Rydberg atoms with neutral and charged species are described, and the use of multichannel quantum defect theory in the study of Rydberg atomic systems is discussed. Experimental and theoretical research in this extensive field is also reviewed, making the book valuable to both graduate students and established researchers in physics and physical chemistry.
We investigate the impact of combined electric and magnetic fields on the structure of ultralong-range polar Rydberg molecules. Our focus is hereby on the parallel as well as the crossed field configuration, taking into account both the s -wave and p -wave interactions of the Rydberg electron and the neutral ground state atom. We show the strong impact of the p -wave interaction on the ultralong-range molecular states for a pure B -field configuration. In the presence of external fields, the angular degrees of freedom acquire vibrational character, and we encounter two- and three-dimensional oscillatory adiabatic potential energy surfaces for the parallel and crossed field configuration, respectively. The equilibrium configurations of local potential wells can be controlled via the external field parameters for both field configurations depending on the specific degree of electronic excitation. This allows us to tune the molecular alignment and orientation. The resulting electric dipole moment is in the order of several kDebye, and the rovibrational level spacings are in the range of 2– . Both properties are analyzed with varying field strengths.
This volume offers a timely look at Rydberg states of atoms in external fields and dielectronic recombination. Each topic provides authoritative coverage, presents a fresh account of a flourishing field of current atomic physics and introduces new opportunities for discovery and development. Topics considered include electron-atom scattering in external fields; observations of regular and irregular motion as exemplified by the quadratic zeeman effect and other systems; Rydberg atoms in external fields and the Coulomb geometry; crossed-field effects in the absorption spectrum of lithium in a magnetic field; precise studies of static electric field ionization; widths and shapes of stark resonances in sodium above the saddle point; studies of electric field effects and barium autoionizing resonances; autoionization and dielectronic recombination in plasma electric microfields; dielectronic recombination measurements on multicharged ions; merged beam studies of dielectronic recombination; Rydberg atoms and dielectronic recombination in astrophysics; and observations on dielectronic recombination.