Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Optical Instruments

Measurement of Ba 6pnk autoionizing states in the electric fields

Li Shi

Published Jan 1, 2002• 0 citations
OpenAlex

Abstract

We present a isolated core excitation method for producing the autoionizing states in the electric fields. Many experimental autoionizing states excited from both M =0 and | M |=1 Stark initial states were measured with this method combined with a proper polarization configuration. Furthermore, the preliminary discussions conclude that the profile of autoionizing states in the electric field becomes more complex due to the mixing of the electric fields.

Related papers

Saturation effects on Ba 6pnl(l=0,2) and 6pnk(|M| =0,1) autoionization spectra

Shiben Li, Dai Chang-Jian

Using a three-step laser saturation excitation technique, the saturation effects on the Ba 6p n s ( J = 1) and 6p n d ( J = 1, 3) autoionization spectra are observed systemically in zero field. These saturation spectra are introduced to determine the high n members of 6p nl ( l = 0, 2) autoionizing series and are used to analyse the channel interactions among the autoionizing series in zero field. Furthermore, the saturation excitation technique is applied to the electric field case, in which the saturation spectra of Ba 6p nk (| M | = 0, 1) autoionizing Stark states are measured. Most of these saturation spectra are observed for the first time so far as we know, which indicate the mixing of the autoionizing states in the electric fields.

Chinese Physics•Jan 24, 2007•8 citations

Effects of electric fields on doubly excited autoionizing Rydberg states of barium

Kambiz Ali Safinya, J. F. Delpech, Thomas F. Gallagher

We report the effects of static electric fields on the doubly excited $6{p}_{\frac{1}{2}}\mathrm{nl}$ states of barium in the region ${n}^{*}=12$. Using a three-step laser excitation scheme we have measured the electric-field dependence of the positions and autoionization widths of the $6{p}_{\frac{1}{2}}\ensuremath{-}17s,16p,15d,12l (l=4\ensuremath{-}10),12f, \mathrm{and} 16s$ states at field values of up to 4.92 kV/cm. The photoexcitation spectra of the autoionizing states exhibit interference effects which are well understood and provide a better understanding of the character of these states in electric fields. The systematic study of the spectra and positions allows us to explain the field dependence of the autoionization widths in terms of electric-field mixing of the discrete portions of the auoionizing states. The relationship of these effects to dielectronic recombination rates of ions and electrons in plasma microfields is discussed.

Physical Review A•Sep 1, 1980•20 citations

Electric field effects on autoionizing states of Sr atom

Ji Qiu

By using the multi-step excitation technique, Sr atoms are excited from ground state 5S2 to (4d3/2np, nf)J=1 and (4d5/2np, nf)J=1 autoionizing states via valence state 4d23P0. Their Stark spectra near n = 12, 13, 14 in an electric field of 0-5kV/cm are observed and discussed.

Acta Optica Sinica•Jan 1, 1990•0 citations

Technique for measuring the linewidth of autoionizing Rydberg states

Grzegorz Waligorski, Lei Zhou, William E. Cooke

We present a variation of the isolated-core excitation (ICE) method that measures the linewidths of autoionizing resonances regardless of the limitations imposed by an instrumental linewidth. By exciting an autoionizing state via different ICE satellite transitions, we determine the linewidth of the state from Fano q values of asymmetric spectral profiles. Since the Fano q is insensitive to instrumental broadening, we can measure autoionizing resonance linewidths below the bandwidth of our laser.

Physical Review A•Feb 1, 1997•6 citations

Investigation of the Stark effect in krypton autoionizing Rydberg series with the use of two-step laser excitation

Christian Delsart, Jean-Claude Keller

The first detailed observation of the perturbations by an electric field of the Rydberg autoionizing resonances of a rare-gas atom is reported. The Stark spectroscopy of autoionizing Rydberg states converging to the second ionization limit $4{p}^{5}^{2}P_{\frac{1}{2}}^{o}$ in Kr I is performed in an atomic beam with the use of a two-step laser excitation from the $4{p}^{5}5s{[\frac{3}{2}]}_{2}^{0}$ metastable state. In addition to the verification of the ${({n}^{*})}^{\ensuremath{-}3}$ dependence of the zero-field width of two autoionizing series and of the linear dependence of the Stark-manifold splittings with the electric field, we have observed an ${(n)}^{0.7}$ law for the dependence of the Stark-manifold splitting along the series, an important narrowing and dissymmetrization of the $n{d}^{\ensuremath{'}}$ resonances, and a nonlinear-field behavior of Stark-manifold components in the vicinity of the first anticrossing. Discussions are carried out with the use of the recent work on Rydberg-Stark spectroscopy and on autoionizing states in two-electron atoms.

Physical Review A•Aug 1, 1983•26 citations

Spectroscopy of autoionizing states using state-selective ion detection

G. T. Xu, Xinqiang Wang, William E. Cooke

The authors have measured the population in each of the 5d 3/2 (m j ) ion states following autoionization of the (6p 3/2 nd) J=MJ=3 state by using a circularly polarized laser to excite the Ba + 5d 3/2 to 6p 1 2/ transition, and observing the polarized fluorescence of the Ba + 6p 1/2 to 6s 1/2 transition. The branching ratios for autoionization into each of the 5d 3/2 in l j channels can be related to these ion populations by using angular momentum algebra. The fractions of ions found in the m j =+3/2, +1/2, -1/2 and -3.2 state of the 5d 3/2 ion states were 5.9(+or-2.6)%, 4.5(+or-1.9)%, 3.2(+or-1.3)% and 1.9(+or-0.6)% respectively. This method can easily be generalized to measure the branching ratio for autoonization into other ion states.

Journal of Physics B Atomic Molecular and Optical Physics•Mar 14, 1993•2 citations
We present a isolated core excitation method for producing the autoionizing states in the electric fields. Many experimental autoionizing states excited from both M =0 and | M |=1 Stark initial states were measured with this method combined with a proper polarization configuration. Furthermore, the preliminary discussions conclude that the profile of autoionizing states in the electric field becomes more complex due to the mixing of the electric fields.
Using a three-step laser saturation excitation technique, the saturation effects on the Ba 6p n s ( J = 1) and 6p n d ( J = 1, 3) autoionization spectra are observed systemically in zero field. These saturation spectra are introduced to determine the high n members of 6p nl ( l = 0, 2) autoionizing series and are used to analyse the channel interactions among the autoionizing series in zero field. Furthermore, the saturation excitation technique is applied to the electric field case, in which the saturation spectra of Ba 6p nk (| M | = 0, 1) autoionizing Stark states are measured. Most of these saturation spectra are observed for the first time so far as we know, which indicate the mixing of the autoionizing states in the electric fields.
We report the effects of static electric fields on the doubly excited 6p12nl6{p}_{\frac{1}{2}}\mathrm{nl}6p21​​nl states of barium in the region n∗=12{n}^{*}=12n∗=12. Using a three-step laser excitation scheme we have measured the electric-field dependence of the positions and autoionization widths of the $6{p}_{\frac{1}{2}}\ensuremath{-}17s,16p,15d,12l (l=4\ensuremath{-}10),12f, \mathrm{and} 16s$ states at field values of up to 4.92 kV/cm. The photoexcitation spectra of the autoionizing states exhibit interference effects which are well understood and provide a better understanding of the character of these states in electric fields. The systematic study of the spectra and positions allows us to explain the field dependence of the autoionization widths in terms of electric-field mixing of the discrete portions of the auoionizing states. The relationship of these effects to dielectronic recombination rates of ions and electrons in plasma microfields is discussed.
We present a variation of the isolated-core excitation (ICE) method that measures the linewidths of autoionizing resonances regardless of the limitations imposed by an instrumental linewidth. By exciting an autoionizing state via different ICE satellite transitions, we determine the linewidth of the state from Fano q values of asymmetric spectral profiles. Since the Fano q is insensitive to instrumental broadening, we can measure autoionizing resonance linewidths below the bandwidth of our laser.
The first detailed observation of the perturbations by an electric field of the Rydberg autoionizing resonances of a rare-gas atom is reported. The Stark spectroscopy of autoionizing Rydberg states converging to the second ionization limit $4{p}^{5}^{2}P_{\frac{1}{2}}^{o}$ in Kr I is performed in an atomic beam with the use of a two-step laser excitation from the 4p55s[32]204{p}^{5}5s{[\frac{3}{2}]}_{2}^{0}4p55s[23​]20​ metastable state. In addition to the verification of the ${({n}^{*})}^{\ensuremath{-}3}$ dependence of the zero-field width of two autoionizing series and of the linear dependence of the Stark-manifold splittings with the electric field, we have observed an (n)0.7{(n)}^{0.7}(n)0.7 law for the dependence of the Stark-manifold splitting along the series, an important narrowing and dissymmetrization of the $n{d}^{\ensuremath{'}}$ resonances, and a nonlinear-field behavior of Stark-manifold components in the vicinity of the first anticrossing. Discussions are carried out with the use of the recent work on Rydberg-Stark spectroscopy and on autoionizing states in two-electron atoms.
The authors have measured the population in each of the 5d 3/2 (m j ) ion states following autoionization of the (6p 3/2 nd) J=MJ=3 state by using a circularly polarized laser to excite the Ba + 5d 3/2 to 6p 1 2/ transition, and observing the polarized fluorescence of the Ba + 6p 1/2 to 6s 1/2 transition. The branching ratios for autoionization into each of the 5d 3/2 in l j channels can be related to these ion populations by using angular momentum algebra. The fractions of ions found in the m j =+3/2, +1/2, -1/2 and -3.2 state of the 5d 3/2 ion states were 5.9(+or-2.6)%, 4.5(+or-1.9)%, 3.2(+or-1.3)% and 1.9(+or-0.6)% respectively. This method can easily be generalized to measure the branching ratio for autoonization into other ion states.