Abstract
ISOTOPIC WEIGHTS BY THE DOUBLET METHOD CONTINUING work with ray new mass-spectrograph1, I have made measurements of several more doublets. That of N, CH2 was easy to obtain with a mixture of nitrogen and methane, and gave very consistent results. The vapour of pure heavy water did not, at first, give as strong a line at 20, OD2, as was hoped, but as 19, ODH, was good, CF4 was introduced and the doublet F, ODH measured. Later the intensity of OD2 was improved and enabled a comparison with 20Ne to be made. The latter line was then coupled with doubly charged 40A, giving a very close doublet. By the use of BF3 with a suitable quantity of neon, the fairly wide doublet 10B, 20Ne + + was photographed. The spectra also showed the expected doublet at 29 due to 29Si and 10BF. This gave the first accurate measurement of the mass of the former. The following are the results:
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