A PULSED ELECTRON-NUCLEAR DOUBLE-RESONANCE EFFECT

Pulsed electron-nuclear double-resonance effects in phosphorus-doped silicon were studied by monitoring the electron spin echo arising from the donor electron. The application of a four-pulse sequence of EPR and NMR pulses was found to produce a periodic attenuation and restoration of the electron spin echo as the carrier frequency of the rf pulses was swept. This phenomenon is explained by considering the z component of the local field produced at the donor electron by surrounding shells of distant Si29 nuclei. © 1969 The American Physical Society.