The presence in molecular-beam magnetic resonance of transitions with Δm1 has made possible measurements of gyromagnetic ratios which are very much smaller than the nuclear magneton. Such low values are normally associated with the rotation of ¹Σ molecules. The following values of gJ in nuclear magnetons per rotational quantum number have been determined in this way: CO₂, (-)0.05508±{}0.00005; OCS, -0.02889±{}0.00002; CS₂, (-)0.02274±{}0.00002; C₂{H}₂, -0.04903±0.00004; Fe{(CO)}₅, 0.0210±0.0005; Ni{(CO)}₄, 0.0179±0.0005; C{F}₄, 0.031±0.005. The sign of{g}J$ in ${C}₂H₂ has been found to be the same as that in OCS, which was known to be negative. The signs in parentheses are assumed. The technique also gives the spin-rotational interaction constant in C₂{H}₂$ as 3.58±{}0.01 kc/sec.
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Cederberg et al. (1964) studied this question.
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