Chinese Physics Letters

Autoionizing Distribution of the Triply Excited Double Rydberg States in La Atom

Wei Sun, Xiu-Ping Xie, Wen Tao Huang, Zhong Zhi-Ping, Chengbin Xu, Ping Xue, Xiang-Yuan Xu

Published Jun 1, 2000• 3 citations

Abstract

The autoionization distribution of the triply excited double Rydberg states (TEDRS) 5 d 5/2 N Lnl ( N ⩽ 22; n ⩽ 50; L, l < 4) of La has been investigated by using five-laser resonance excitation in combination with a method of sequential ionization by a pulsed electric field and a constant electric field. The experimental results exhibit that the La atoms in TEDRS predominantly single-autoionize to the ionic Rydberg states located in a few Rydberg manifolds. Furthermore, a difference of autoionization mechanisms between TEDRS above and those below the double ionization threshold is found.

DOI: 10.1088/0256-307x/17/6/007

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Chinese Physics Letters

Autoionizing Distribution of the Triply Excited Double Rydberg States in La Atom

Wei Sun, Xiu-Ping Xie, Wen Tao Huang, Zhong Zhi-Ping, Chengbin Xu, Ping Xue, Xiang-Yuan Xu

Published Jun 1, 2000• 3 citations

Publisher

Abstract

DOI: 10.1088/0256-307x/17/6/007

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{\mathrm{La}}^{+}

ion distributions among high Rydberg states resulted from the decay of TEDRS.

Novel field-ionization behavior of very high Rydberg states of Ar (

n\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}50--250

) is observed using sequential pulsed electric fields. Fast autoionization acts as a filter against adiabatic field ionization near the

{}^{2}{P}_{1/2}

threshold, whereas both diabatic and adiabatic field ionization occur near the

{}^{2}{P}_{3/2}

threshold. Sequences of up to 9 equivalent pulses yield recurrent field ionization signals near the

{}^{2}{P}_{3/2}

threshold, provided that the field returns close to zero between pulses, demonstrating a statistical redistribution of the Rydberg population amongst all states of a given Stark manifold near zero field.

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.