A survey of the first spectrum of protactinium

Protactinium

“…Experimental measurements (Marrus et al, 1961;Giaechetti, 1966;Richards et al, 1968) and theoretical calculations (Judd, 1962;Wilson, 1967Wilson, , 1968) agree that the ground state configuration of the neutral Pa atom is almost certainly [Rn] 5f 2 6d 1 7s 2 . However, some unpublished calculations by Maly (cited by Cauchois (1971)) indicated that the total relativistic energy of that structure was 0.9 eV higher than that of a 5f 1 6d 2 7s 2 configuration, implying that the latter may be the more stable of the two.…”

Interpretation of the low even configurations of neutral protactinium (Pa I)

“…published an analysis of PaI involving 460 even levels and 340 odd levels including all the levels found by Giacchetti [3]. published an analysis of PaI involving 460 even levels and 340 odd levels including all the levels found by Giacchetti [3].…”