Optical observation of multiphoton NMR of absorption in semiconducting crystals
Berkovits V.L., Safarov V.I.
We have observed, for the first time, multiphoton (up to 5 photons) NMR absorption in a solid, in an investigation, by the optical-orientation method, of quadrupole-perturbed NMR transitions of As75 in mixed GaAs-AlAs crystals.