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Hyperfine Interaction, Zeeman and Stark Effects for Excited States in Potassium

Belin, G; Holmgren, L; Lindgren, I and Svanberg, Sune LU (1975) In Physica Scripta 12(5). p.287-294
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physica Scripta
volume
12
issue
5
pages
287 - 294
publisher
Institute of Physics Publishing Ltd.
external identifiers
  • Scopus:5344243571
ISSN
0031-8949
DOI
10.1088/0031-8949/12/5/007
language
English
LU publication?
yes
id
2d2a7baf-7007-4d8c-9d12-3fcb6b37ac15 (old id 2257443)
date added to LUP
2012-02-23 23:36:47
date last changed
2016-09-13 15:20:02
@misc{2d2a7baf-7007-4d8c-9d12-3fcb6b37ac15,
  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.},
  author       = {Belin, G and Holmgren, L and Lindgren, I and Svanberg, Sune},
  issn         = {0031-8949},
  language     = {eng},
  number       = {5},
  pages        = {287--294},
  publisher    = {ARRAY(0x78374e0)},
  series       = {Physica Scripta},
  title        = {Hyperfine Interaction, Zeeman and Stark Effects for Excited States in Potassium},
  url          = {http://dx.doi.org/10.1088/0031-8949/12/5/007},
  volume       = {12},
  year         = {1975},
}