Abstract
Optogalvanic signals arising from a group of transitions in Zr I have been studied under irradiation of a cold cathode glow discharge with polarised laser light. The signals increase with the application of a magnetic field of a few gauss crossed with the symmetry axis of the polarisation, but the change is not related to the direction of current in the discharge. The occurrence of these magnetic resonances depends on at least partial saturation of the optogalvanic signals. The empirical evidence leads to the conclusion that the resonances result from changes of occupation probability in the excited state upon removal of degeneracy by the magnetic field-a non-linear, level-crossing effect.
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