Keywords
Abstract
Study of continuous wave electron paramagnetic resonance spectra of impurity erbium ions in yttrium orthosilicate Y2SiO5 on an ELEXSYS spectrometer with a dielectric resonator reveals unusual dependence of the shape of the resonance lines on the intensity of microwave excitation. At a relatively high intensity and partial saturation of the resonance transition, the shape of the line is a superposition of a usual line corresponding to the derivative of the resonant absorption and an anomalous line corresponding to the resonance absorption itself. It is proposed that the appearance of the anomalous component of the line is associated with the simultaneous excitation of magnetic dipole and electric quadrupole transitions in the coupled system of magnetic dipole and electric quadrupole oscillators of the electron spin system of erbium ions.