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the Bill9 line appeared as a well-resolved doublet having a separa- tion given by the splitting of the upper state, 0.828 cm'l. The close components in each member of the doublet due to the much smaller ground-state splitting could not be resolved but produced a noticeable widening. The Bij2" samples were obtained as the RaE (5-day half-life) in equilibrium with 13 millicuries of RaD. The Bi2"' was isolated by the ion exchange method of Raby and Hyde,' which was found to give a 98-percent yield with negligible loss of Pb. A number of separations were made at intervals of several weeks. Considerable difficulty was experienced at first with Bi29 contamination, so that an efficient separation process was essential. The amount of RaE isolated in each separation was determined by standard 3-counting procedures and was usually about 1.5X 10' gram. For Bi"', X3067 was found to be a single sharp line. An upper limit to any hfs which might possibly be present is roughly 0.1 the width of the Bi2"' line. Since such a small splitting would lead to an un- reasonably small gi value, it seems much more probable that no splitting is present and I=0. Hence the
Physical Review – American Physical Society (APS)
Published: Dec 1, 1953
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