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Acta Physica Sinica

STARK STRUCTURES OF NEUTRAL YTTERBIUM RYDBERG STATES WITH |m|=0,1

Dawei Fang

Published Jan 1, 1995• 0 citations
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Abstract

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.

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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.
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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.
The Stark structures in a cesium atom around n = 18 are numerically calculated. The results show that the components of 20D states with a small azimuthal quantum number | m | shift upward a lot, and those with a large | m | shift downward a little within 1100 V/cm. All components of P states shift downward. Experimental work has been performed in ultracold atomic cesium. Atoms initially in 6P 3/2 state are excited to high- n Rydberg states by a polarization light perpendicular to the field, and Stark spectra with | m | = 1/2, 3/2, 5/2 are simultaneously observed with a large linewidth for the first time. The observed spectra are analyzed in detail. The relative transition probability is calculated. The experimental results are in good agreement with our numerical computation.
In the spectral range between 480 nm and 630 nm the Stark effect of the transitions n 1Q-2 1S, n 1Q-2 1P and n 3Q-2 3P (n=3÷10, Q=S, P,...) was studied using electric field up to 1500 kV/cm. For such a high field the Stark splitting becomes greater than the simple structure of the atom. Hence anticrossings of the Stark components of the same magnetic quantum number occur. The experimental results have been compared with the theoretically determined shifts. The results of calculations show good agreement with observation.