Small samples o f acti nium, produced by Lra nsmu tin g rad ium ha\'c been im'cs tiO"aLcd ?pectroscopically by p hotographi ng Lhe spect'ra of light em.itted by thc samples when ex~ited III a hollow cathode or III ftrCS and spar ks between copper or sil ver electrodcs. The wavelengths we re m easured, a nd inte nsit ies estim.ated, for som e 500 lines eharaetc ri st ic of aetinillm. in t he spectral ra nge 2062 .00 to 7886.82 A. A compari so n of li ne characteristics in d ifferent sources permitted sortin g into five categories; a bout 140 lin es belong to Ae I , more than 300 were ascnbed to Ac II, 8 were dcfill itcly assigned to Ac nT, 5 may belong to Ae IV, and abouL 80 represe nt ba nd heads character istic of AeO, the actinium-m onoxide mol ecule.
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Meggers et al. (1957) studied this question.