ИСТИНА

The report is devoted to application of convolution technique for obtaining of quantitative information from EPR spectra. Common method, which is based on double integration of an EPR spectrum, has a low accuracy when noise is significant. Another possibility is to measure spectrum amplitude and to compare it with amplitude of another spectrum (is referred here to as standard spectrum). The standard spectrum should be recorded for a sample with known number of paramagnetic particles and also this spectrum should to have high signal-to-noise ratio (SNR). Applying the last method only two points of experimental spectrum are used to obtain quantitative information. Besides, procedure of measurement of highly noisy spectrum amplitude cannot give accurate results. In this work another approach to quantitative treatment of EPR spectra based on a convolution with standard spectrum is proposed. Accuracy of convolution technique was studied in series of numerical experiments using artificially distorted EPR spectra. Very low sensitivity of the proposed method to the presence of noise was demonstrated (error is less than 5% up to SNR = 2).