which restricts our analysis of TOF distributions to flight times below 1200 µs. Although our analysis for O is restricted to 1200 µs, a definite signal for TD-slow can be seen in FiberForm but not in vitreous carbon. The TD-slow signal decreases as the surface temperature increases, with the TD-slow flux accounting for ~8% of the total flux at 1123 K and ~5% at 1823 K. The flux components of O are shown in Figures and for FiberForm and vitreous carbon respectively, for both the increasing and the decreasing temperature sweeps. The TD-prompt flux increases markedly beyond 1200 K for vitreous carbon, which may be ascribed to surface-adsorbed O desorbing promptly as the surface temperature is increased . A similar trend is observed for FiberForm, where the TD-prompt flux dominates beyond 1300 K. However, the rate of TDprompt flux increase for vitreous carbon is approximately 2.8 times faster than for FiberForm.