Abstract
The $J=\frac{3}{2}\ensuremath{\leftarrow}\frac{1}{2}$ fine-structure transition in atomic ${}^{27}\mathrm{Al}$ in its ground ${}^{2}P$ state has been detected in the laboratory by far-infrared laser magnetic resonance. The fine-structure interval has been measured accurately as 3359.6228(17) GHz or 112.064 95(6) ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$. The spectra show the hyperfine structure associated with a nuclear spin of $\frac{5}{2}$ for ${}^{27}\mathrm{Al}.$ The splittings are well reproduced by the hyperfine parameters determined earlier by atomic beam methods. The analysis of the laser magnetic-resonance spectra casts doubt on the published value for the Zeeman parameter ${g}_{3/2}$ also from the atomic beam measurements. Although the value determined in this paper is intrinsically much less accurate, it is in better agreement with the value obtained by a completely independent theoretical calculation.
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