The kinetics of the C2H5O2+ NO→ C2H5O+ NO2 reaction is examined by two real-time techniques. NO consumption and NO2 formation are measured using transient diode laser absorption, whereas ethylperoxy loss and ethylnitrite formation are monitored by time- resolved UV spectroscopy. Simultaneous fits of the NO and NO2 concentration versus time profiles yield rate constants consistent with the results of the C2H5O2 and C2H5ONO ...