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RESEARCH PRODUCT

Glow Rate Technique for Spectroscopy of Complex Thermostimulated Relaxation Processes

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The glow rate technique (GRT) developed for the analysis of complex trap spectra, is the extension of the known heating rate method to the full glow curve. It is shown that using two glow curves measured at different heating rate constants, a special mean activation energy of simultaneously emptied traps can be obtained as a function of temperature or emitted light sum to a good approximation. Expressions have been derived for the calculation of the mean activation energy function from data measured using a linear, logarithmic or a hyperbolic heating mode. Theoretical expressions for the mean activation energy function have been obtained and discussed for arbitrary trap distribution functions (TDF) in activation energy and frequency factor. The mean activation energy function additional to the glow curve gives direct quantitative information about the activation energies of traps involved in the thermostimulated relaxation. Application of the curve fit analysis to both the glow intensity and mean energy data offers a procedure for the advanced evaluation of parameters of the trap spectrum, which allows estimation of the true TDF as well as verifying the model used. The GRT can be applied down to very low intensities.