Abstract
Dressed state electron paramagnetic resonance (EPR) nutations of E 1′ centers in neutron-irradiated crystalline quartz are observed using, in addition to the continuous microwave field 2 B 1 cos ( ω t ) and the pulse of longitudinal magnetic field, a linearly polarized RF field 2 B 2 cos ( ω rf t ) along the static magnetic field. The dressed nutation of the frequency ω 2 = γ B 2 is detected when the RF field frequency, ω rf, is near the frequency of bare spin nutation ω 1 = γ B 1 ( γ is the electron gyromagnetic ratio). Our results give evidence for the line-narrowing effect associated with the dressed nutation and the amplitude asymmetry of the left ( ω 1− ω 2) and right ( ω 1+ ω 2) components in Fourier spectra of observed nutation signals.
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