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原子与分子物理学报

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

Published Jan 1, 1990• 0 citations
OpenAlex

Abstract

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.

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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

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.

Chinese journal of atomic and molecular physics•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

Short-pulse photoionization of perturbed Rydberg states: Laser-induced autoionization

Rutger B. Vrijen, J. H. Hoogenraad, Lambertus D. Noordam

Laser-induced autoionization, a form of forced autoionization, is discussed. Highly excited atomic Rydberg states generally have a small cross section for photoionization due to their small overlap with the nucleus. The cross section for photoionization can be strongly enhanced if the Rydberg series is perturbed by an atomic state with a relatively large cross section for photoionization. The photoionization dynamics of such a perturbed Rydberg system shows strong similarities to that of an autoionizing Rydberg series. For intense laser pulses, which strongly couple the perturber to the continuum, the photoionization rate is limited by the coupling between the Rydberg states and the perturber or, in other words, the autoionization rate. The model describing this ionization dynamics is applied to the barium 6snd${(}^{1,3}$${\mathit{D}}_{2}$) state which is perturbed by the 5d7d${(}^{1}$${\mathit{D}}_{2}$) state. The calculations show good agreement with experimental results of photoionization of barium Rydberg states with subpicosecond laser pulses of light of 620 nm in wavelength.

Physical Review A•Sep 1, 1995•7 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
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.
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.
Laser-induced autoionization, a form of forced autoionization, is discussed. Highly excited atomic Rydberg states generally have a small cross section for photoionization due to their small overlap with the nucleus. The cross section for photoionization can be strongly enhanced if the Rydberg series is perturbed by an atomic state with a relatively large cross section for photoionization. The photoionization dynamics of such a perturbed Rydberg system shows strong similarities to that of an autoionizing Rydberg series. For intense laser pulses, which strongly couple the perturber to the continuum, the photoionization rate is limited by the coupling between the Rydberg states and the perturber or, in other words, the autoionization rate. The model describing this ionization dynamics is applied to the barium 6snd(1,3{(}^{1,3}(1,3D2{\mathit{D}}_{2}D2​) state which is perturbed by the 5d7d(1{(}^{1}(1D2{\mathit{D}}_{2}D2​) state. The calculations show good agreement with experimental results of photoionization of barium Rydberg states with subpicosecond laser pulses of light of 620 nm in wavelength.