ESR applications in solid state physics

ESR/EPR is a standard technique to investigate, control and develop paramagnetic centers in semiconductor materials. Our benchtop MS 5000 EPR/ESR spectrometer as a fully digital bench top EPR spectrometer enables such measurements.

Solid state physics

The development of a modern society is driving the advancement in semiconductor industry. EPR/ESR spectroscopy plays a vital role in controlling defects in semiconductors.

Advantages of ESR spectrometer MS 5000

  • Automatic angular dependence measurements by high precision goniometer (accessory, option)

  • Powerful software for spectra integration, noise- filtering, resolution enhancement by deconvolution and automatic line position determination for all measured angles, representation of line positions as a function of angle 

  • Signal channel with dynamics over 130db enables measurements of extremely small signals up to extremely strong signals in the same spectrum, absolutely no “sensitivity setting” or similar necessary before the measurement

  • Up to 250.000 data- points per spectrum

  • Any magnetic field scan range between 10mT and 600mT, 24bit (1:16.000.000) resolution

  • Powerful “after measurement optimization” facilities of obtained data such as:

    • signal intensity representation

    • noise suppression versus resolution optimization via digital filtering

    • magnetic field modulation-phase optimization, I-Q- representation

    • representation of first or second harmonic of magnetic field modulation

    • microwave phase optimization (absorption / dispersion signal), I-Q- representation

  • “DC-measurement” facility for the detection of signals with extremely long relaxation times

  • Rapid scan facility up to 1s for 300mT scan range, measurement of rapid passage effects

  • Special “saturation behavior enhanced” measurement of EPR- signals. This delivers spectra where the signal intensity of lines is proportional to the degree of saturation of the spin species belonging to the different lines (at a given microwave power and temperature). This may greatly facilitate the analysis of complex spectra with many overlapping lines do to different spin species present at a time. Non saturated spin species exhibit no signal, whereas heavily saturated species exhibit strong signals. 

  • Automatic precise cavity- Q measurement by microwave synthesizer, automatic detection of cavity aging effects

  • Integrated microwave frequency measurement

  • For EDMR experiments Magnetic field modulation scans from 1Hz to 30Hz, reference frequency output for external lock-in detection. No problems with AFC- instabilities because of electric contacts or wires in the cavity due to microwave setting by microwave synthesizer

  • For LFA or similar experiments Possibility (option) of zero- crossing magnetic field scans. Scans may range from -600mT to +600mT