| 1. |
- Belin, G, et al.
(författare)
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Hyperfine Interaction, Zeeman and Stark Effects for Excited States in Potassium
- 1975
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Ingår i: Physica Scripta. - : IOP Publishing. - 0031-8949 .- 1402-4896. ; 12:5, s. 287-294
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Tidskriftsartikel (refereegranskat)abstract
- Using the optical double resonance and level crossing methods, properties of several excited S , P , and D states in 39 K were studied. The S and D states were populated using stepwise excitation with the first P state as an intermediate level. An rf lamp and a CW dye laser were used in the first and second excitation steps, respectively. The studied P states were populated in the cascade decay of states, excited with the laser. The following results for the magnetic depole interaction constant a, the Landé g J factor, and the tensor polarizability α 2 were obtained for the studied states: 7 2 S 1/2 : a = 10.78(5) MHz, g J = 2.0020(10); 8 2 S 1/2 : a = 5.99(8) MHz, g J = 2.0028(12); 6 2 P 1/2 : a = 4.05(7) MHz, g J = 0.6663(4); 6 2 P 3/2 : a = 0.89(5) MHz, g J = 1.3337(8); 7 2 P 1/2 : a = 2.18(5) MHz, g J = 0.6659(6); 7 2 P 3/2 : a = 0.49(4) MHz, g J = 1.3336(8); 5 2 D 3/2 : |a| = 0.44(10) MHz, g J = 0.7997(7), |α 2 | = 9.64(45) MHz/(kV)/cm) 2 ; 5 2 D 5/2 : |a| = 0.24(7) MHz, g J = 1.2004(10), |α 2 | = 13.4(7) MHz/(kV)/cm) 2 ; 6 2 D 3/2 : |a| = 0.2(2) MHz, g J = 0.7997(14), |α 2 | = 33.8(1.7) MHz/(kV)/cm) 2 ; 6 2 D 5/2 : |a| = 0.1(1) MHz, g J = 1.2013(20), |α 2 | = 47.6(2.4) MHz/(kV)/cm) 2 . Theoretical values for the magnetic dipole interaction constant have been obtained using a limited many-body perturbation expansion. The Polarization effect, which is due to single excitations from the restricted Hartree-Fock model, is included to all orders, while the true correlation effect is omitted. The results are compared with the experimental values, and the agreement is found to be quite good. For the S and P states the polarization effect is of the order of 10-20%, and it is responsible for roughly half of the deviation of the Hartree-Fock values from experiment. For the D states, on the other hand, the effects are much more drastic. The sign of the a factors has not been measured. The perturbative calculation yields positive values for all 2 D 3/2 states and negative values for all 2 D 5/2 states. The theoretical magnitudes are in agreement with the observed ones.
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| 4. |
- Hogervorst, W, et al.
(författare)
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Stark Effect Investigation of D States in 85 Rb and 133 Cs Using Level Crossing Spectroscopy with a CW Dye Laser
- 1975
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Ingår i: Physica Scripta. - : IOP Publishing. - 0031-8949 .- 1402-4896. ; 12:1-2, s. 67-74
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Tidskriftsartikel (refereegranskat)abstract
- Stark effect investigations in the 6, 7 and 8 2 D 3/2,5/2 levels of 85 Rb and the 8, 9 and 10 2 D 3/2,5/2 levels of 133 Cs were performed with the level crossing technique. The levels were populated in a two-step excitation process, involving a CW tunable dye laser. The tensor polarizability of all states was measured and a good agreement with theoretical values, obtained with the Coulomb approximation, is found. Furthermore, the signs of the dipole interaction constants, determined to absolute value in earlier experiments, could be inferred. The sign was found to be positive for the 2 D 3/2 states and negative for the 2 D 5/2 states, indicating strong polarization effects in the magnetic hyperfine interaction.
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