THE NUCLEAR MOMENTS OF P31

Abstract

Hyperfine structures have been observed in the [Formula: see text] transitions of P IV with a 21 ft. concave grating and in the [Formula: see text] transition of P III with a transmission echelon. The half-widths of the lines, excited in an electrodeless discharge, were reduced by mixing neon with the phosphorus vapor and by using a condenser of small capacity. Their intensities were increased by discharging the condenser through the exciting coil nine times per half-cycle by means of a rotating spark gap. The structures of the P IV lines confirm I = 1/2 and show that μ, the nuclear magnetic moment, is positive. μ = 1.15 ± 0.05 n.m. and μ = 1.11 ± 0.1 n.m. are obtained from the P IV and P III structures, respectively.