Abstract

A new technique allows the longitudinally modulated electron nuclear double resonance (LOMENDOR) signal to be observed at fixed static magnetic field and microwave frequency, by sweeping the frequency difference between the two irradiating radiofrequency waves. The experimental setup is described. The linewidth dependence on the “cross” relaxation time T 1p is discussed. The method is suitable for nuclear longitudinal relaxation time measurements. The dependence of the lineshape of first and second harmonic signals on the frequency difference and on the electron and nuclear saturation factors is also analyzed and discussed.

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