Constitution of Neodymium, Samarium, Europium, Gadolinium and Terbium

Abstract

AFTER a long and troublesome series of investigations, I have obtained settings of the apparatus for accelerated anode rays good enough to admit of a provisional analysis of the rare earth elements. Since the beams of rays are still very faint, these results could only be obtained by increasing the aperture of the slits to the limit allowing resolution. In consequence, only the roughest estimates of relative abundance can be made when the mass numbers differ by unity.