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Acta Physica Sinica

LEVEL STRUCTURE OF THE RYDBERG STATES OF CALCIUM ATOM IN ELECTRIC FIELD

Sen Zhang, QIU JI-ZHEN, WANG GANG, 浙江大学物理系

Published Jan 1, 1989• 0 citations
Publisher

Abstract

The Stark spectrum of Ca atom with m = 0 in the vicinity of n = 10 to n = 13 have been obtained by using two-step excitation and photoionization methods in the applied electric field from 0 to 8 kV/cm. The experimental results show that the 3d2 3P0 and 3d2 3P2 valence states are repelled by n= 12 Stark manifold. The interaction among the zero-field non-degenerate states, valence states and Stark states are discussed. The interference phenomenon, in which valence state and Stark states take part, has been observed. The interference is enhanced when the electric field increase.

DOI
10.7498/aps.38.481

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The Stark spectrum of Ca atom with m = 0 in the vicinity of n = 10 to n = 13 have been obtained by using two-step excitation and photoionization methods in the applied electric field from 0 to 8 kV/cm. The experimental results show that the 3d2 3P0 and 3d2 3P2 valence states are repelled by n= 12 Stark manifold. The interaction among the zero-field non-degenerate states, valence states and Stark states are discussed. The interference phenomenon, in which valence state and Stark states take part, has been observed. The interference is enhanced when the electric field increase.
We present results of an experimental survey of the n=15n=15n=15 state of Na in electric fields from 0 to 4 kV/cm. Both linear and higher-order Stark effects play important roles. States with low ∣m∣|m|∣m∣ show marked differences from hydrogenic behavior, particularly in the vicinity of level crossings. Computed values for the energy levels are in good agreement with the data. The experimental method provides a simple technique for populating selected Stark or angular momentum levels of a Rydberg state.
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.
The Stark effect in Rydberg atoms has potential applications in the areas of dipole-dipole interaction, quantum information, quantum control, and so on. Many reflevant theoretical calculations and experimental studies about the Stark effect of alkali metal and alkali earth metals have been reported, but the other atom’s Stark effect is studied still relatively less. Our goal in this paper is to reflearch the third main group atom’s Stark effect in a large electric field. First, according to the level data of gallium atom in zero-field, we obtain the quantum defects from the modified Ritz formula in each state by using a nonlinear least-squares-fitting algorithm. The quantum defects as a function of the principal quantum number are analyzed in detail. Influences of both the core polarization and the penetrating valence electron on the quantum defect are discussed according to the fitting results. Then we use the Numerov algorithm to calculate the radial wave functions of atomic gallium. Finally, the Stark structures of Rydberg states around n=7 and n=18 are numerically calculated by matrix diagonalization. Results show that at the levels above n=7 manifold states, (n+1)P is higher than nD state, and it is in contrast to the levels below the n=7 manifold states. This phenomenon is different from the usual Stark structure of alkali metal atoms, the level’s order of which does not change with the principal quantum number. The Stark levels with the identical |m| anti-cross each other, and those with different |m| cross. Our results give an important reflerence for related reflearches, and are of great significance for insight into the atomic structure and the interaction between the atomic core and the highly excited electrons.