The Nuclear Moments of Cæsium, Rubidium, and Indium

Abstract

IN my work¹ on the hyperfine structure of the lines of the principal series of cæsium, I suggested that 1/2 was the value of i, the quantum number of the rotation of the nucleus; but I pointed out that it might well be higher, it being impossible to determine it with certainty owing to the hyperfine structure of the P levels being too fine to resolve. In the meantime Schüller² has shown that the value of nuclear quantum number can be determined quite simply from the intensity ratio of the components of the hyperfine structure doublets. In cæsium the two components are of very nearly equal intensity; so that the value of i must be high: it may well be 9/2, or perhaps higher; in order to find the exact value, experiments are being made to determine very accurately the intensity ratio of the components.