Magnetic resonance spectroscopy in silver-doped silicon

In silver-doped silicon, several new electron paramagnetic resonance spectra were observed. Three of these, labeled Si-NL45, Si-NL46, and Si-NL47, were detected in n-type samples. The spectra have trigonal symmetry; the effective electron spin value S equals 1/2. The spectra Si-NL45 and Si-NL46, with the perpendicular g values close to 6 and 8, can alternatively be described by electron spins S=5/2 and S=7/2, respectively, and g values close to 2. The Si-NL47 center has both principal g values significantly deviating from 2. They can be accounted for by taking crystal-field splitting and spin-orbit coupling into consideration. On the basis of the correlation of the production of these centers with the Si-NL44 center and the analysis with high values of electron spin, all these centers are tentatively identified as silver-related complexes.