To investigate the surface chemistry during the first half cycle, we first recorded an IR background spectrum and then pulsed small doses of TDMAH onto pristine CoO(111) at 400 K. After each pulse, we recorded an IR spectrum. The recorded spectra are shown in Figure as a waterfall plot and in Figure as a color plot. The evolution of the integrated peak area for signals at 3676 cm -1 , in the CH region, at 2188 cm , and between 1630 -1540 cm -1 is plotted against the number of pulses in Figure .