Homodyne Balanced Mixer Electron Spin Resonance Spectrometer

1 January 1961

journal article
research article
Published by AIP Publishing in Review of Scientific Instruments

Vol. 32 (1) , 35-40
https://doi.org/10.1063/1.1717140

Abstract

A simple electron spin resonance (ESR) spectrometer for the detection of organic free radicals is described. The salient features are: (1) homodyne balanced mixer detection, (2) improvement of the magnetic field homogeneity by means of two pairs of current shims, and (3) new tuning procedure independent of the resonance spectrum itself, making use of the klystron‐stabilization error signal. At 3200 gauss the magnetic field homogeneity is better than 2:10⁵ over a sample volume of 0.25 cm³. The sensitivity is such that 2×10¹³ spins of the free radical DPPH can be detected.

Keywords

This publication has 3 references indexed in Scilit:

Sensitivity Considerations in Microwave Paramagnetic Resonance Absorption Techniques
Bell System Technical Journal, 1957
Spectromètre pour résonance paramagnétique
Annales de Physique, 1956
A Phase-Sensitive Detector Circuit Having High Balance Stability
Review of Scientific Instruments, 1951