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Title: Diamagnetic shifts in atomic hyperfine structure

Abstract

A series of precision measurements of the hyperfine structure of the 5/sup 2/S/sub 1/2/ ground state of two isotopes of atomic rubidium in magnetic fields of up to 8 T was made using a laser optical-pumping technique. Observed departures from the predictions of the Breit-Rabi formula include the first measurement of a magnetically induced quadrupole hyperfine shift. A field dependence of the effective value of the nuclear-to-electronic g-factor ratio g/sub I//g/sub J/ was revealed, and the previous observation of a diamagnetic shift in dipole hyperfine structure in /sup 85/Rb was confirmed and extended to /sup 87/Rb. In order to distinguish among these effects, all of the ..delta..m/sub I/ = +/- 1 nuclear Zeeman transitions in both /sup 85/Rb and /sup 87/Rb were measured at each field. Four evacuated, wax-coated sample cells were used, containing natural isotopic abundance rubidium vapor. Perturbation theory is used to examine the effects of an external magnetic field on the ground-state hyperfine structure of an alkali atom. A Hamiltonian is developed and evaluated to yield a modified Breit-Rabi formula which provides an excellent fit to the experimental data. Approximate calculations performed using this model are in good agreement with the dipole and quadruple results. The shiftmore » in the g-factor ratio, on the other hand, is much larger than predicted.« less

Authors:
Publication Date:
Research Org.:
Harvard Univ., Boston, MA (USA)
OSTI Identifier:
5924888
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: Thesis (Ph.D)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; RUBIDIUM 85; HYPERFINE STRUCTURE; RUBIDIUM 87; GROUND STATES; GYROMAGNETIC RATIO; OPTICAL PUMPING; PERTURBATION THEORY; ZEEMAN EFFECT; ALKALI METAL ISOTOPES; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; ENERGY LEVELS; INTERMEDIATE MASS NUCLEI; ISOTOPES; NUCLEI; ODD-EVEN NUCLEI; PUMPING; RADIOISOTOPES; RUBIDIUM ISOTOPES; STABLE ISOTOPES; YEARS LIVING RADIOISOTOPES; 640300* - Atomic, Molecular & Chemical Physics

Citation Formats

Lipson, S J. Diamagnetic shifts in atomic hyperfine structure. United States: N. p., 1986. Web.
Lipson, S J. Diamagnetic shifts in atomic hyperfine structure. United States.
Lipson, S J. Wed . "Diamagnetic shifts in atomic hyperfine structure". United States.
@article{osti_5924888,
title = {Diamagnetic shifts in atomic hyperfine structure},
author = {Lipson, S J},
abstractNote = {A series of precision measurements of the hyperfine structure of the 5/sup 2/S/sub 1/2/ ground state of two isotopes of atomic rubidium in magnetic fields of up to 8 T was made using a laser optical-pumping technique. Observed departures from the predictions of the Breit-Rabi formula include the first measurement of a magnetically induced quadrupole hyperfine shift. A field dependence of the effective value of the nuclear-to-electronic g-factor ratio g/sub I//g/sub J/ was revealed, and the previous observation of a diamagnetic shift in dipole hyperfine structure in /sup 85/Rb was confirmed and extended to /sup 87/Rb. In order to distinguish among these effects, all of the ..delta..m/sub I/ = +/- 1 nuclear Zeeman transitions in both /sup 85/Rb and /sup 87/Rb were measured at each field. Four evacuated, wax-coated sample cells were used, containing natural isotopic abundance rubidium vapor. Perturbation theory is used to examine the effects of an external magnetic field on the ground-state hyperfine structure of an alkali atom. A Hamiltonian is developed and evaluated to yield a modified Breit-Rabi formula which provides an excellent fit to the experimental data. Approximate calculations performed using this model are in good agreement with the dipole and quadruple results. The shift in the g-factor ratio, on the other hand, is much larger than predicted.},
doi = {},
url = {https://www.osti.gov/biblio/5924888}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1986},
month = {1}
}

Thesis/Dissertation:
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