A high resolution, far-infrared electron spin resonance spectrometer at 250 GHz

K. A. Earle

doi:10.1117/12.2297861

1 October 1991 A high resolution, far-infrared electron spin resonance spectrometer at 250 GHz

K. A. Earle

Proceedings Volume 1576, 16th International Conference on Infrared and Millimeter Waves; 157644 (1991) https://doi.org/10.1117/12.2297861
Event: 16th International Conference on Infrared and Millimeter Waves, 1991, Lausanne, Switzerland

Abstract

Using the principles of quasi-optics, a high resolution ESR spectrometer operating at 250GHz has been constructed. It has been used to study the temperature dependent linewidths of PDT, a nitroxide spin probe, over a range of temperatures for which motional narrowing theory is valid. The narrowest lines that we have studied to date are 89 microtesla (890 mG) peak to peak in a Larmor field of 8.9 tesla and demonstrate the resolution of the spectrometer. We have studied 0.5mM PDT in toluene-d8, an isotropic solvent, and 2.0mM PDT in phase V, a thermotropic liquid crystal, in order to compare our results with careful work at X-band (9.5 GHz).

Citation Download Citation

K. A. Earle "A high resolution, far-infrared electron spin resonance spectrometer at 250 GHz", Proc. SPIE 1576, 16th International Conference on Infrared and Millimeter Waves, 157644 (1 October 1991); https://doi.org/10.1117/12.2297861

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