Analysis of the movement of line-like samples of variable length along the X-axis of a double TE104 and a single TE102 rectangular cavity

Journal of Magnetic Resonance
M MazúrM Valko

Abstract

Movement of line-like samples with lengths from 5 to 50 mm along the x-axis of the double TE104 rectangular cavity has been analyzed. The observed dependencies of the EPR signal intensity versus sample position showed: (i) a sharp maximum for sample lengths from 5 to 20 mm; (ii) a plateau, over which the EPR signal intensity remained constant within experimental errors of 0.26-1.07%, for lengths from 30 to 40 mm; and (iii) a "sloping plateau," which could be approximated by the linear function (correlation, r = 0.98) for sample length 50 mm. Theoretical values of the experimentally observed dependencies of the intensity versus sample position were calculated using the modified sine-squared function and the correlation between observed and theoretically predicted dependencies is very good. The experimental dependence of the EPR signal intensity versus the sample length for samples situated at the same point in the cavity was nonlinear with a maximum for the 40-mm sample. The dependence of the EPR signal intensity upon the movement of a large cylindrical sample (o.d. 4 mm and length 100 mm) along the x-axis of the cavity was similar to that found for the 50-mm sample. However, an additional oscillating signal superimposed on the ...Continue Reading

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