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Zeeman quantum beats have been observed in the fluorescent emission from individual rotational levels of the B³Π₀ᵤ⁺ state of ¹²⁷I₂ after excitation by a short resonant dye-laser pulse. The derived Land\'e factors gJ and g₁ (chemical shift) are compared with the spinrotation hyperfine coupling constants.
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Wallenstein et al. (1974) studied this question.
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