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Copyright by Kirsten Viering 2006 - Raizen Lab - The University of ...

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Figure B.2: Schematic <strong>of</strong> the ground state and the first excited state energy level. <strong>The</strong><br />

hyperfine splitting is indicated for the 3 2 S1/2 ground state and the 3 2 P3/2 state. <strong>The</strong><br />

magnetic splitting is according to the anomalous Zeeman effect. <strong>The</strong> wavelengths for<br />

the resonant transitions are presented, as are the Landé-g-factors. Energy is not to scale.<br />

B.2 Sodium in an external magnetic field<br />

<strong>The</strong> degeneracy <strong>of</strong> the (2F+1) magnetic levels breaks down in an external magnetic<br />

field. If we take the magnetic field to be along the atomic quantization axis (z-axis), the<br />

Hamiltonian<br />

HB = µB<br />

<br />

<br />

gSSz + gLLz + gIIz Bz<br />

(B.1)<br />

describes the interaction <strong>of</strong> the atom with the magnetic field. gS, gL and gI are the<br />

Landé-g-factors for the electron spin, electron orbital and nuclear spin respectively<br />

[20]. If hyperfine splittings are important, F is a good quantum number, and the<br />

55

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