The isotopic constitution and atomic weights of zinc, tin, chromium and molybdenum

Abstract

In a previous communication a method of photometry of mass-spectra was described by which the relative abundance of isotopes could be measured. The accuracy of the method was shown to be amply sufficient for a preliminary survey of complex elements with a view to finding out any simple laws, if such existed, governing relative abundance, and for checking atomic weights measured by more usual ways. The following is an account of further experiments made by means of the same apparatus and general method. The sequence in which the elements are investigated is affected by considerations of many kinds. In seeking relations between abundance ratios one naturally selects the most complex element which can be easily handled and avoids the examination, immediately after, of another which has isobaric lines. After the completion of the work on krypton, xenon and mercury already published ( loc. cit. ) zinc was successfully investigated.