Triple coincidence measurement of annihilation radiation — chemical application

Three photon yields and $\text{2γ}\text{3γ}$ ratios have been measured for several copper containing substances. The different extents of positronium formation have been substantiated through Doppler broadening, angular correlation and magnetic quenching in angular correlation and in peak-to-valley ratios of singles spectra at different fields. Application to chemical characterisation is indicated.