Chinese Physics Letters

Autoionizing Process of the Double Rydberg State

Chengbin Xu, Xiang-Yuan Xu, Wen Tao Huang, Ping Xue, Zhao Runchuan, Cheng Zhu, Chen Dieyan

Published Dec 1, 1995• 2 citations

Abstract

Using five-laser resonance excitation and double time-of-flight spectroscopy, the double Rydberg states N Lnl ( N ⩽ 66; n ⩽ 85; L , l < 4) of Ca have been obtained. The distribution of Ca + Rydberg states, which is from the autoionization of the double Rydberg state has been measured. A novel result has been observed.

DOI: 10.1088/0256-307x/12/12/003

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Chinese Physics Letters

Autoionizing Process of the Double Rydberg State

Chengbin Xu, Xiang-Yuan Xu, Wen Tao Huang, Ping Xue, Zhao Runchuan, Cheng Zhu, Chen Dieyan

Published Dec 1, 1995• 2 citations

Publisher

Abstract

DOI: 10.1088/0256-307x/12/12/003

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R. R. Jones, Thomas F. Gallagher

We have observed the Ba n' ${\mathit{p}}_{1/2}$ np and n' ${\mathit{p}}_{1/2}$ nd double Rydberg series (n>60,n'0.75n) using a five-laser excitation scheme. A single photon excites the n' ${\mathit{p}}_{1/2}$ nl levels from an initially populated Ba 8 ${\mathit{s}}_{1/2}$ nl autoionizing state. If there were no correlation between the two valence electrons, we would observe only the n'pnp or n'pnd states. However, we observe strong excitation to n'snl and n'dnl states as well. We observe virtually no n'snl and n'dnl states for n'0.4n. For n'>0.75n the Rydberg structure that is observed for the lower n' levels disappears into an apparently unstructured continuum.We have observed the Ba n'${\mathit{p}}_{1/2}$np and n'${\mathit{p}}_{1/2}$nd double Rydberg series (n>60,n'0.75n) using a five-laser excitation scheme. A single photon excites the n'${\mathit{p}}_{1/2}$nl levels from an initially populated Ba 8${\mathit{s}}_{1/2}$nl autoionizing state. If there were no correlation between the two valence electrons, we would observe only the n'pnp or n'pnd states. However, we observe strong excitation to n'snl and n'dnl states as well. We observe virtually no n'snl and n'dnl states for n'0.4n. For n'>0.75n the Rydberg structure that is observed for the lower n' levels disappears into an apparently unstructured continuum.

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We have studied the

nu

=1 Rydberg states of BaF in the energy region E=38800-39100 wn (n*=15-25) via optical-optical double resonance spectroscopy. Rydberg states excited above the first ionization potential spontaneously autoionize and

^{138}

^{19}

^{+}

ions are detected by TOF-MS. In addition, BaF possesses a particularly low ionization potential, which allows for the study of autoionization dynamics in the absence of predissociative decay. This work extends the assignments of core-penetrating Rydberg states of BaF (Jakubek and Field, 2000) for applications to state-selective ion production schemes. Polarization and Stark spectroscopy techniques will be discussed in the context of accurate and efficient assignment of spectra.

The formation of

{\mathrm{Ca}}^{+}

ions is measured in an effusive Ca beam by exciting through either the 4s4

{\mathit{p}}^{1}

{\mathit{P}}_{1}

or the 4s5

{\mathit{p}}^{1}

{\mathit{P}}_{1}

state to highly excited Ca*(4

{\mathit{snd}}^{1}

{\mathit{D}}_{2}

) Rydberg states. In agreement with previous work by McLaughlin and Duquette [Phys. Rev. Lett. 72, 1176 (1994)], when the Rydberg states are accessed through the 4s5

{\mathit{p}}^{1}

{\mathit{P}}_{1}

state, we detect a large increase in

{\mathrm{Ca}}^{+}

ions for n=25, compared to other high-n Rydberg states. It had been reported (Fabrikant [Phys. Rev. A 48, R3411 (1993)]; McLaughlin and Duquette) that ``ground-state--Rydberg-state'' collisions cause this large increase in ion production and that the result provides a precise value of the electron affinity of Ca through the binding energy of the Rydberg electron. However, a variation of the original experiment in which the same Rydberg states are accessed through the 4s4

{\mathit{p}}^{1}

{\mathit{P}}_{1}

level instead of the 4s5

{\mathit{p}}^{1}

{\mathit{P}}_{1}

level shows no enhancement of ions for any particular Rydberg level. With a three-laser experiment we show that the enhanced ionization effect for the 25d state is due to the 3${\mathit{d}}_{3/2}

9

{\mathit{f}}_{5/2}$, ${\mathit{J}}^{\mathrm{\ensuremath{\pi}}}$=${2}^{\mathrm{\ensuremath{-}}}$ autoionizing resonance, which is coincidentally accessed from the Ca(4s25

{\mathit{d}}^{1}

{\mathit{D}}_{2}

) state by the 808-nm photon involved in the original experiment by McLaughlin and Duquette. The existence of this resonance close to the experimentally observed energy is also established by R-matrix calculations. \textcopyright{} 1996 The American Physical Society.

We have observed the Ba n'

{\mathit{p}}_{1/2}

np and n'

{\mathit{p}}_{1/2}

nd double Rydberg series (n>60,n'0.75n) using a five-laser excitation scheme. A single photon excites the n'

{\mathit{p}}_{1/2}

nl levels from an initially populated Ba 8

{\mathit{s}}_{1/2}

nl autoionizing state. If there were no correlation between the two valence electrons, we would observe only the n'pnp or n'pnd states. However, we observe strong excitation to n'snl and n'dnl states as well. We observe virtually no n'snl and n'dnl states for n'0.4n. For n'>0.75n the Rydberg structure that is observed for the lower n' levels disappears into an apparently unstructured continuum.