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Acta Physica Sinica

FIELD-IONIZATION THRESHOLDS OF RYDBERG STATES AND VALENCE STATE OF NEUTRAL YTTERBIUM

D. Q. Fang

Published Jan 1, 1995• 0 citations
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Abstract

The Rydberg states and 4f135d6s6p valence state of neutral ytterbium of diff-erent |m| values are obtained by two-step excitation using polarized lasers. The field-ioaization thresholds for 6sns 1S0 (n=21-28, |m|=0) and 6snd 1D2 (n=20-27, |m|=0,1) Rydberg states as well as 4f135d6s6p valence state are measured. The thresholds are also calculated by introducing a Stark effective quantum number ns. The comparision between the experimental and calculated results is furnished. The interaction of valence state with Rydberg states, which affets the thresholds, is dis-cussed.

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Acta Physica Sinica•Jan 1, 1994•0 citations
The Rydberg states and 4f135d6s6p valence state of neutral ytterbium of diff-erent |m| values are obtained by two-step excitation using polarized lasers. The field-ioaization thresholds for 6sns 1S0 (n=21-28, |m|=0) and 6snd 1D2 (n=20-27, |m|=0,1) Rydberg states as well as 4f135d6s6p valence state are measured. The thresholds are also calculated by introducing a Stark effective quantum number ns. The comparision between the experimental and calculated results is furnished. The interaction of valence state with Rydberg states, which affets the thresholds, is dis-cussed.
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.
The Stark spectra of Yb atom with m=0 and |m|=1 in the vicinity of n=17 to n=20 have been obtained by using two-step excitation and photoioni-zation method in the applied electric field from 0 to l500V/cm. The Stark splittings and shifts observed in the experiment have been calculated by using numerical integration method. The thoretical results are consistent generally with the experiments. The dependence of the anticrossings of Stark manifolds with quantum defects is investigated. The comparison between the m=0 and |m|=1 Stark structures is furnished.
High Rydberg levels of ytterbium were studied in a beam of metastable atoms. Levels of the series4f14 6snd were populated from the metastable 4f14 6s 6p 3Po level by means of the U.V. light of a frequency-doubled single-mode dye laser and detected using the field ionization technique. The critical ionization fields Fc of the levels 4f14 6snd 3D1 (24 ~ n ~ 57) were measured and found to obey the saddle point law (Fc = (16 n*4)^-1).The hyperfine structures of the odd isotopes were investigated. They are very peculiar due to the fact that the hyperfine interaction is of the same order of magnitude as (or even for the highest n values, much more important than) the spin-orbit and electrostatic interactions. A theoretical account of the observed structures using the Slater-Condon parametric method is given. The relative influence of the excited (nd) and of the non-excited (6s) optical electron could thus be studied. Furthermore the influence of a valence level perturbing only the odd isotopes components for n = 26 was demonstrated.
High Rydberg levels of ytterbium were studied in a beam of metastable atoms. Levels of the series 4f14^{14}14 6snsnsnd were populated from the metastable 4f14^{14}14 6s 6p 3^33Po_oo​ level by means of the U.V. light of a frequency-doubled single-mode dye laser and detected using the field ionization technique. The critical ionization fields FcF_cFc​ of the levels 4f14^{14}14 6snsnsnd 3^33D1_11​ (24 ≤ n ≤ 57) were measured and found to obey the saddle point law (FcF_cFc​ = (16 n∗4n^{*4}n∗4)−1^{-1}−1). The hyperfine structures of the odd isotopes were investigated. They are very peculiar due to the fact that the hyperfine interaction is of the same order of magnitude as (or even for the highest nnn values, much more important than) the spin-orbit and electrostatic interactions. A theoretical account of the observed structures using the Slater-Condon parametric method is given. The relative influence of the excited (nnnd) and of the non-excited (6s) optical electron could thus be studied. Furthermore the influence of a valence level perturbing only the odd isotopes components for nnn = 26 was demonstrated.