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Physical Review A

Autoionizing states of the ytterbium atom by three-photon polarization spectroscopy

Jonghoon Yi, Jongmin Lee, Hong Jin Kong

Published Apr 1, 1995• 33 citations
Publisher

Abstract

The autoionizing states of ytterbium (Yb) were investigated by three-photon polarization spectroscopy. Ytterbium atoms were excited to autoionizing states through the transition 6${\mathit{s}}^{2}$ $^{1}$${\mathit{S}}_{0}$--6s6p $^{3}$${\mathit{P}}_{1}$--4${\mathit{f}}^{13}$${(}^{2}$${\mathit{F}}_{7/2}$)6${\mathit{s}}^{2}$6${\mathit{p}}_{3/2}$ (J=2). The total angular momenta J of the autoionizing states were identified by comparing the line intensities from the spectra recorded with different combinations of the laser polarization. In this work, 17 autoionizing states including many new ones were investigated. For all these states Fano parameters and J values are measured.

DOI
10.1103/physreva.51.3053

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Physical Review A•Jan 1, 1983•12 citations
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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.
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.
An improved method for the angular momentum measurement of autoionizing levels of complex atoms based on photoionization polarization spectroscopy is reported. In this method, a variation of the ion yield is measured as a function of the combination of the polarizations of the lasers used to excite the autoionizing level through a ladder of intermediate resonant states. Here, eight combinations of different polarizations in three lasers are used, which include not only circular but also linear polarizations. It has been confirmed that the angular momentum of the autoionizing level can be determined uniquely by relative ion-yield measurements for any combination of angular momenta of the levels of the excitation ladders by choosing appropriate intensities of the lasers.
Laser investigation of the photoionization spectra in the presence of an electric field has been performed in $\ensuremath{\pi}$ and $\ensuremath{\sigma}$ polarizations on an ytterbium atomic beam from the particular level 4f146s7s1S04{f}^{14}6s7s^{1}S_{0}4f146s7s1S0​ which was populated by a two-step excitation. Broad modulations (in $\ensuremath{\pi}$ polarization) and Stark resonances in the vicinity of the zero-field ionization limit are interpreted satisfactorily as in the case of alkali atoms. However, the photoionization spectra are deeply affected by the presence of two perturbing levels belonging to the configuration 4f135d26s4{f}^{13}5{d}^{2}6s4f135d26s. This phenomenon is explained by strong interference effects between the structured Stark continuum and the field-induced autoionizing states corresponding to the doubly excited levels.