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Excitation and electronic decay of autoionization states of alkali-earth atoms (calcium atomic states)

A Borovik, I. S. Aleksakhin, A. V. Kuplyauskene

Optics and SpectroscopySep 1, 19810 citations

Excitation and electronic decay of autoionization states of alkali-earth atoms. Calcium (atomic optically forbidden and ionic states)

A Borovik, I. S. Aleksakhin, A. V. Kuplyauskene

Optics and SpectroscopyMar 1, 19820 citations

Radiative decay of NaI autoionization states excited in electron-atom collisions

Yurij V. Zhmenyak, Vasyl S. Vukstich, I.P. Zapesochnyi

Apr 20, 19821 citation

Barium Circular Atoms Prepared by the Crossed-Field Method

M. Chéret, F. Roussel, T. Bolzinger +3 more

Circular two-electron atoms, i.e. Rydberg atoms where the angular momentum of one of the valence electrons is maximum, have been prepared in barium ( n = 21) by using the adiabatic crossed-field method already tested in alkali atoms. This simple and versatile method proves to be very efficient for heavy atoms with large quantum defects. Circular alkaline-earth atoms represent a decisive step for the preparation of doubly-excited Rydberg states with long autoionization lifetimes.

Europhysics Letters (EPL)Jun 1, 198912 citations

Multistep Excitation of Alkaline Earth Atoms to Autoionizing States

Thomas F. Gallagher

Using a multistep laser excitation of alkaline earth atoms in an atomic beam we are able to excite autoionizing states in which one of the electrons can be in a state of almost arbitrary n and 1. The multistep approach uses all single photon transitions in which one electron is excited at a time, as shown in Fig. 1. In addition to the technical simplification of requiring low energy photons, exciting one electron at a time simplifies the observed spectra and their interpretation.

Topical Meeting on Laser Techniques in the Extreme UltravioletJan 1, 19820 citations

Autoionization of Rydberg states with large angular momentum: Application to alkaline-earth atoms

Michel Poirier

This paper is devoted to the autoionization process of large-angular-momentum Rydberg states. After a brief account of autoionization formalism in nonrelativistic theory and single-configuration approximation, we apply it to atomic states with one electron of large angular momentum. The dominant contribution is the direct one and the exchange contribution is ignored. In this framework, the autoionization width varies with the principal quantum number as ${n}^{\mathrm{\ensuremath{-}}3}$ and exponentially with the angular momentum. When two excited electrons interact with a spherically symmetric core, it is demonstrated that the interaction between the Rydberg electron and the core polarized by the valence electron is proportional to the interaction between the two active electrons. Using newly derived radial matrix elements, we obtain a generally good agreement between our results and experiments on barium and strontium. Large-l Rydberg states are shown to be stable versus autoionization as soon as l is about 7. Possible refinements of our method are reviewed.This paper is devoted to the autoionization process of large-angular-momentum Rydberg states. After a brief account of autoionization formalism in nonrelativistic theory and single-configuration approximation, we apply it to atomic states with one electron of large angular momentum. The dominant contribution is the direct one and the exchange contribution is ignored. In this framework, the autoionization width varies with the principal quantum number as ${n}^{\mathrm{\ensuremath{-}}3}$ and exponentially with the angular momentum. When two excited electrons interact with a spherically symmetric core, it is demonstrated that the interaction between the Rydberg electron and the core polarized by the valence electron is proportional to the interaction between the two active electrons. Using newly derived radial matrix elements, we obtain a generally good agreement between our results and experiments on barium and strontium. Large-l Rydberg states are shown to be stable versus autoionization as soon as l is about 7. Possible refinements of our method are reviewed.

Physical Review AOct 1, 198851 citations

Excitation and electronic decay of autoionization states of alkaline earth atoms. 4: Barium

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