| 1. |
- Belin, G, et al.
(författare)
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Hyperfine Interaction, Zeeman and Stark Effects for Excited States in Cesium
- 1976
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Ingår i: Physica Scripta. - : IOP Publishing. - 0031-8949 .- 1402-4896. ; 14:1-2, s. 39-47
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Tidskriftsartikel (refereegranskat)abstract
- Our previous measurements in the P and D series in 133 Cs have been extended to a number of higher lying levels, populated in a two-step excitation process involving an rf lamp and a CW dye laser. The D states were studied with the level-crossing technique, while the optical-double-resonance method was used for the investigation of the P states. For the magnetic dipole interaction constant a , the Landé g J factor, and the tensor polarizability α 2 we obtain 12 2 P 3/2 : a = 1.10(3) MHz, g J = 1.3340(15) 13 2 P 3/2 : a = 0.77(5) MHz, g J = 1.3337(20) 7 2 D 3/2 : | a | = 7.4(2) MHz 14 2 D 3/2 : | a | = 0.425(7) MHz 15 2 D 3/2 : | a | = 0.325(8) MHz 16 2 D 3/2 : | a | = 0.255(12) MHz 17 2 D 3/2 : | a | = 0.190(12) MHz 18 2 D 3/2 : | a | = 0.160(10) MHz 13 2 D 5/2 : α 2 = 19(1) GHz/(kV/cm) 2 14 2 D 5/2 : α 2 = 37(2) GHz/(kV/cm) 2 15 2 D 5/2 : α 2 = 70(4) GHz/(kV/cm) 2 16 2 D 5/2 : α 2 = 120(6) GHz/(kV/cm) 2 17 2 D 5/2 : α 2 = 199(10) GHz/(kV/cm) 2 18 2 D 5/2 : α 2 = 323(16) GHz/(kV/cm) 2 Ab initio calculations of many-body perturbation type, including polarization effects to all orders, have been performed in order to obtain theoretical values of the hyperfine structure constants. The resulting a factors are listed together with the corresponding experimental values for most S, P , and D states in 133 Cs measured so far. The discrepancy between the experimental and theoretical values is mainly due to the omission of the correlation effect, which is essentially as important as the polarization effect. Still, for the D states the polarization effect is large enough to yield negative values for all the 2 D 5/2 states, which is in accordance with the experimental results. Semiempirical values of the a factors have also been obtained using the Fermi-Segré-Goudsmit formula, and the results are compared with the experimental values. The measured values of α 2 agree well with values calculated with the Coulomb approximation due to Bates and Damgaard.
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| 2. |
- Belin, G, et al.
(författare)
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Hyperfine Interaction, Zeeman and Stark Effects for Excited States in Rubidium
- 1976
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Ingår i: Physica Scripta. - : IOP Publishing. - 0031-8949 .- 1402-4896. ; 13:6, s. 351-362
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Tidskriftsartikel (refereegranskat)abstract
- Highly excited P and D states in 87 Rb were examined using a two-step excitation procedure. A conventional rf lamp and a CW dye laser were used for the first and second step, respectively. The following results for the magnetic dipole interaction constant a , the electric quadrupole interaction constant b , the Landé g J factor, and the tensor polarizability α 2 were obtained in level-crossing and optical-double-resonance experiments: 9 2 P 3/2 : a = 4.05(3) MHz, b =0.55(3) MHz, g J = 1.3335(15) 10 2 P 3/2 : a = 2.60(8) MHz, g J = 1.3332(20) 8 2 D 3/2 : a = 2.840(15) MHz, b = 0.17(2) MHz 8 2 D 5/2 : a = -1.20(15) MHz, g J = 1.1998(15) 9 2 D 3/2 : a = 1.900(10) MHz, b = 0.11(3) MHz 9 2 D 5/2 : a = (-)0.80(15) MHz, g J = 1.1995(15), α 2 = 180.3(9.0) MHz/(kV/cm) 2 Many-body calculations of the hyperfine structure of Rb have been performed. The polarization effect is included to all orders, whereas the correlation effect is omitted. The negative a factors for the 2 D 5/2 states, indicating large perturbations, are explained by the polarization contribution. A review of experimental hyperfine interaction constants, Landé g J factors and tensor polarizabilities for rubidium is given together with theoretical values of the a factors. The quadrupole moment for 87 Rb is obtained from the b factors for the 2 P 3/2 and 2 D 3/2 states, using quadrupole parameters from the many-body calculations. The correlation effect is included in a semi-empirical way.
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| 3. |
- Fredriksson, K, et al.
(författare)
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Investigation of the fine structure in the 2 D sequence of sodium using level-crossing spectroscopy
- 1976
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Ingår i: Journal of Physics B: Atomic and Molecular Physics. - : IOP Publishing. - 0022-3700. ; 9:8, s. 1237-1246
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Tidskriftsartikel (refereegranskat)abstract
- Splittings in the n 2 D sequence were measured for n=4-9. An accuracy of about 0.1% was obtained in level-crossing measurements on an atomic beam. The D states were populated by step-wise excitation, using an RF lamp and a CW dye laser. A method for measuring the sign of the spin-orbit coupling constant is demonstrated. With the present measurements, the highly anomalous n 2 D sequence in sodium has now been studied for n=3-16.
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| 4. |
- Grundevik, P, et al.
(författare)
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Isotope shifts in dysprosium measured by high resolution laser spectroscopy
- 1976
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Ingår i: Physics Letters. Section A: General, Atomic and Solid State Physics. - : Elsevier BV. - 0375-9601. ; 56:1, s. 25-26
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Tidskriftsartikel (refereegranskat)abstract
- Using a pulsed dye laser, acting on a collimated atomic beam, the isotope shifts between the dysprosium isotopes 164, 162, and 160 were measured with high precision in three lines, , and 5652 Å.
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| 5. |
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