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Laser magnetic resonance transitions within the 3PJ ground state of the oxygen atom have been detected using optically pumped lasers at 147.8 μm (CH3NH2) and 145.7 μm (CH3OD). The 3P0–3P1 fine structure spacing derived for 16O is 68.71649 (±4×10−5) cm−1 and 3.5×10−4 cm−1 larger for 18O.
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Davies et al. (1978) studied this question.
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