Fig. 3. (a) Isothermal photoreaction at 222 K. Prior to reaction, 1 L ethanol is dosed at a temperature of 120 K. UV excitation starts at 23 seconds and an immediate increase in acetaldehyde production is observed, while the ethanol trace remains unchanged. Note that the slight change in the molecular hydrogen trace is attributed to cracking in the QMS rather than to the production of H2. Part (b) shows the integrated mass signal of figure (a), which shows the same trend as Fig. 2(c).
