Abstract
An electron spin resonance (ESR) system is described in which a fluid sample is pressurized and flowed through a fused silica capillary that traverses the microwave cavity of an ESR spectrometer. The capillary is heated to a high temperature, and well-resolved spectra of short-lived free radicals may be seen at steady-state concentration during pyrolysis. The system operates to 20.7 MPa and 700 °C. High-pressure hydrogen may be injected prior to pyrolysis. A spectrum of benzyl during pyrolysis of toluene at 20.7 MPa and 680 °C is shown.
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