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AIP conference proceedings

Study of highly excited states of Yb

Xiang-Yuan Xu, Wuyin Huang, C. B. Xu, M. Xue, D. Y. Chen

Published Jan 1, 1995• 1 citation
Publisher

Abstract

We report here the first study of the Yb double‐Rydberg states based on a new time‐of‐flight mass spectroscopy system with five‐lasers resonance excitation. The first quantitative measurement of relative excitation strength for various core states was worked out. The atomic Rydberg states, the autoionizing Rydberg states and ionic Rydberg states were also investigated.

DOI
10.1063/1.47593

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We report here the first study of the Yb double‐Rydberg states based on a new time‐of‐flight mass spectroscopy system with five‐lasers resonance excitation. The first quantitative measurement of relative excitation strength for various core states was worked out. The atomic Rydberg states, the autoionizing Rydberg states and ionic Rydberg states were also investigated.
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.
High-resolution three-photon laser spectroscopy has been performed for the first time to gain new spectroscopic information. Starting from the $6{s}^{2}^{1}S_{0}$ ground state of Yb, 6s15p1,3P16s15p^{1,3}P_{1}6s15p1,3P1​ Rydberg states were populated by two-photon-resonant, three-photon absorption via the 6s7s1S06s7s^{1}S_{0}6s7s1S0​ intermediate level. As a result of two-photon line narrowing Doppler-free spectra, showing well resolved isotope shifts and hyperfine structures, were obtained. From the hyperfine coupling constants 171,173A(1P1)^{171,173}A(^{1}P_{1})171,173A(1P1​) the singlet-triplet mixing was derived.