| Dressed state and two-photon nutations of P1 centers in synthetic diamonds are observed in EPR using longitudinal magnetic-field pulses and a continuous bichromatic radiation, consisting of a transverse microwave field and a longitudinal radio-frequency field. The dependences of the nutation decay times on the P1 concentration are measured. It is shown that the decay of two-photon as well as one-photon nutation is due to the spin-spin interaction between P1 centers. The decay time of the dressed nutation is about nine times longer than that of the one-photon nutation and is caused by the flip-flop transitions of P1 centers. |
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