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Chinese journal of atomic and molecular physics

EXCITATION OF 5dnd(J = 4) AUTOIONIZING STATES OF BARIUM BY MEANS OF MULTI-STEP LASER DRIVING PLUS A SUPERRADIATION PROCESS AND MQDT ANALYSIS

Guoyi Wang

Published Jan 1, 1990• 0 citations
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Abstract

In this work, superradiation is found to play an important role to populate the metastable level 6s5d 1D2 from which 5dnd (J=4) autoionizing Rydberg series were excited through double-resonant laser driving.Experimental results were analysed using 5-channel quantum defect treatment in which three autoionizing Rydberg series and two open channels were included.

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EXCITATION OF 5dnd（J=4） AUTOIONIZING STATES OF BARIUM BY MEANS OF MULTISTEP LASER DRIVING PLUS A SUPERRADIATION PROCESS AND MQDT ANALYSIS

XuLeiZHAO, Yuo-yuan

In this work.superradiation in found to play an important role to populate the metastable level 6s5d ^1 D2 from which 5dnd(J=4) autoionizing Rydberg series were excited through double-resonant laser driving.Experimental results were analysed using 5-channel quantum defect treatment in which three autoionizing Rydberg series and two open channels were included.

原子与分子物理学报•Jan 1, 1990•0 citations

Limitation of sequential laser excitation for double-Rydberg autoionizing states of barium and quantum-defect approach

Jacques Boulmer, Pierre Camus, J. M. Lecomte +1 more

The limitations of methods of excitation and analysis of double-Rydberg states of neutral barium atoms are discussed. Excitation spectra of the type 6snd → 9dn′d are studied and interpreted in a two-channel quantum-defect model for n ≥ 15. No resonance is observed for n < 15, which fixes the limit of the possibilities of the sequential laser excitation. Similar behavior is observed for excitation spectra 6snp → 26dn′p and 6snp → 27sn′p for n < 39.

Journal of the Optical Society of America B•Oct 1, 1988•15 citations

Laser spectroscopy of doubly-excited states in barium

G.J. Kuik, Robert van Leeuwen, R. de Graaf +3 more

With pulsed and cw laser radiation we investigated doubly‐excited, autoionizing states of Ba, 4fnf series were excited from metastable 5d2 states using two pulsed dye lasers and 5dnf intermediate states. To explain the data on high‐lying states knowledge of the wave functions of the intermediate states and their perturbers is prerequisite. In preparation of experiments on double circular states such as 4f2, 4f5g, 5g2 etc., we studied the 5d5g multiplet, excited with two pulsed lasers from 6s5d metastable states. Furthermore we present results of a study of 6pnl states with large l, excited with two narrowband cw lasers. 6snl states were populated in a beam from metastable 5d2 states in the presence of an electric field. The atomic motion was used to reduce the field adiabatically to zero before applying the second excitation step (Stark switching). The results show that further excitation to 7dnl and even Nfnl states is feasible, giving possibilities to study the three‐body Coulomb problem with cw laser resolution.

AIP conference proceedings•Jan 1, 1993•0 citations

Rydberg and autoionizing states of neutral ytterbium

C. B. Xu, Xiang-Yuan Xu, Wenbo Huang +2 more

In the study of Yb atomic Rydberg states, new members of 6sns 1 S 0 series for n=23, 24, 66-116 and 6snd 1 D 2 series for n=81-114 were observed. The data are in excellent agreement with the MQDT analysing results. The autoionizing Rydberg series 6p 1 2 /n's ( 1/2 , 1/2 ) 1 0 were investigated by three-step laser excitation. The ICE model was used to explain the experimental spectrum, and it has been proved to be suitable for describing the excitation of the autoionizing Rydberg states with a weakly-excited core.

Journal of Physics B Atomic Molecular and Optical Physics•Sep 14, 1994•22 citations

OBSERVATION OF THE 5dnl EVEN DOUBLY-EXCITED STATES IN NEUTRAL BARIUM USING TWO-STEP OPTOGALVANIC SPECTROSCOPY

Pierre Camus, M. Dieulin, A. El Himdy

Even parity levels of neutral barium above the 6s ionization limit have been investigated by using a two-step pulsed laser excitation associated with optogalvanic detection of the optical resonances. From the metastable states, 5d6s, populated by a d.c. discharge in a heat-pipe vapour, the doubly excited 5dnl Rydberg series with J values ranging from 0 to 5 and the 6p2 1S0 levels have been observed in the continuum between the first 6s and the second 5d ionization limits of Ba I.

Le Journal de Physique Colloques•Nov 1, 1983•0 citations

Double-Rydberg spectroscopy of the barium atom

Jacques Boulmer, Pierre Camus, P. Pillet

Methods of excitation and analysis of double-Rydberg states of the neutral barium atom are discussed. Spectra of 9dn′d double-Rydberg series of barium are studied and interpreted in a two-channel quantum-defect model. An example of stabilization for the 9d5/227d state is shown. We propose a new investigative method for Rydberg levels of the Ba+ ion that is based on a microwave-ionization process coupled with a double time-of-flight mass spectrometer. This novel setup permits us to obtain initial experimental evidence of highly excited double-Rydberg states, 26dn′p and 27sn′p (n′ ≳ 45), of the barium atom.

Journal of the Optical Society of America B•May 1, 1987•43 citations
In this work, superradiation is found to play an important role to populate the metastable level 6s5d 1D2 from which 5dnd (J=4) autoionizing Rydberg series were excited through double-resonant laser driving.Experimental results were analysed using 5-channel quantum defect treatment in which three autoionizing Rydberg series and two open channels were included.
With pulsed and cw laser radiation we investigated doubly‐excited, autoionizing states of Ba, 4fnf series were excited from metastable 5d2 states using two pulsed dye lasers and 5dnf intermediate states. To explain the data on high‐lying states knowledge of the wave functions of the intermediate states and their perturbers is prerequisite. In preparation of experiments on double circular states such as 4f2, 4f5g, 5g2 etc., we studied the 5d5g multiplet, excited with two pulsed lasers from 6s5d metastable states. Furthermore we present results of a study of 6pnl states with large l, excited with two narrowband cw lasers. 6snl states were populated in a beam from metastable 5d2 states in the presence of an electric field. The atomic motion was used to reduce the field adiabatically to zero before applying the second excitation step (Stark switching). The results show that further excitation to 7dnl and even Nfnl states is feasible, giving possibilities to study the three‐body Coulomb problem with cw laser resolution.
In the study of Yb atomic Rydberg states, new members of 6sns 1 S 0 series for n=23, 24, 66-116 and 6snd 1 D 2 series for n=81-114 were observed. The data are in excellent agreement with the MQDT analysing results. The autoionizing Rydberg series 6p 1 2 /n's ( 1/2 , 1/2 ) 1 0 were investigated by three-step laser excitation. The ICE model was used to explain the experimental spectrum, and it has been proved to be suitable for describing the excitation of the autoionizing Rydberg states with a weakly-excited core.
Methods of excitation and analysis of double-Rydberg states of the neutral barium atom are discussed. Spectra of 9dn′d double-Rydberg series of barium are studied and interpreted in a two-channel quantum-defect model. An example of stabilization for the 9d5/227d state is shown. We propose a new investigative method for Rydberg levels of the Ba+ ion that is based on a microwave-ionization process coupled with a double time-of-flight mass spectrometer. This novel setup permits us to obtain initial experimental evidence of highly excited double-Rydberg states, 26dn′p and 27sn′p (n′ ≳ 45), of the barium atom.