A simple apparatus that extends the applicability of the temperaturehyphen;jump method for the investigation of fast chemical kinetics in solution from the microsecond to the nanosecond time range is described. A sample solution can be resistively heated a maximum of 10deg;C within 50 nsec using the discharge of a coaxial cable capacitor. Relaxation of the reaction to a new equilibrium is followed spectrophotometrically. The design of the sample microcell (minimum volume 40 mgr;l) is of particular interest for biochemists working with relaxation kinetics, because the volume of solution required is an order of magnitude less than for previous Joule heated temperaturehyphen;jump cells.
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