th  - 1988 - 51st ENC Conference

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FLOW NMR AND DNP STUDIES OF DENSE FLUIDSz H. C. Dorn , T. E.
Glass, L° Allen, R° Gittl, C° Tsaio, C° Wild, Department of Chemistry,
Virginia Polytechnic Institute and State University, Blacksburg, VA 24061
and C. S. Yannoni, IBM Almaden Research Center, 650 Harry Road, San Jose, CA
95120.
Recent experiments in our laboratory have demonstrated that a flowing liquid
bolus provides a convenient way to independently optimize the "EPR" and "NMR"
portions of the dynamic nuclear polarization DNP experiment. Specifically,
flow -H DNP experiments at I0 GHz were found to require only 0.5-4 watts of
microwave power in order to achieve saturation (s:l) of a given electron spin
transition for a number of stable spin labels [e.g., tri-t-butylphenoxides,
nitroxides, etc.). Flow H DNP results and applications will be presented for
various flowing fluids (e.g., supercritlcal fluids and liquids). In addition,
a new technique potentially appl~cable for monitoring surfaces, "s011d-liquld
Intermolecular transfer [SLIT), H DNP" will also he discussed.
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