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A rapid mixing cell for nmr and a stopped-flow nmr spectrometer have been constructed. Stoppedflow nmr has been applied to the study of the reaction Ni(NH3)(H20)62+ + H¿0+ -*• Ni(H20)62+ + NH4+. The rate constant obtained is in excellent agreement with the rate constant obtained using optical stopped-flow techniques. Several conditions for the applicability of stopped-flow nmr are discussed.

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High pressure stoppedflow apparatus for the rapid mixing and subsequent study of two fluids under high hydrostatic pressures Rev. Sci. Instrum.The design and construction of two rapid-mixing apparatuses which can be accommodated within the probes of commercial NMR spectrometers are described. The principal features of the cells described are applicable to the construction of stopped-flow cells for any NMR spectrometer.