Microwave magnetic resonance, line shape

Fig. 3. Samples of conventional and old muonium resonances at the frequency 1/12 (See Fig. 2 ). The narrow old signals have also a higher amplitude and a characteristic line shape [22]. The lines in the left column were recorded by sweeping the magnetic field, which was measured in units of the proton NMR, frequency (pp). The lines on the right were obtained using microwave frequency (v) scans...

ESR spectra at X-band were measured with a RE-1006 spectrometer operating at 9,6 GHz (empty cavity at ambient temperature) and 50-lcHz magnetic field modulation. Spectra were recorded at a microwave power of 1 mW and a modulation amplitude 0.02 mT to avoid line shape distortions, which could arise from experimental conditions such as microwave saturation and overmodulation. Scan range was 150-420 mT, Calibration of g-values is based on diphenylpicrylhydracyl (DPPH, g=2.0036) and Cr (g= 1.9796) standards. The amounts of the paramagnetic species (PMS) were calculated by double integration of the resonance line areas. 

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