Evaluation of low-temperature electron paramagnetic resonance in analytical chemistry

Abstract

An evaluation of low-temperature electron paramagnetic resonance has been completed and the possibility of enhanced quantitative lower limits of detection is discussed. By lowering the temperature of the cavity, the Q-factor is considerably increased producing a more efficient system. Also, the relaxation time is optimized by decreasing the temperature of the sample. Different temperatures for each system produced a maximum signal owing to a combination of these two factors. Thus, in order to improve the lower limits of detection for these metal ions, the analytical curves were run at the optimum temperature for each system. These data are compared to the data obtained at room temperature. Also, the instrumental parameter effects have been evaluated. The metal ions investigated are copper(II), manganese (II), titanium(III), vanadium(IV), chromium (III), gadolinium(III), and iron(III).