Figure 18.

(A) CO titration experiment on Au(111) at 77 K. An RF-plasma was used to adsorb reactive oxygen in the quantities given above each curve. The surface is exposed to a beam of CO molecules (flux 9 × 10¹³ molecules/cm².⁴³⁴ (B) CO₂ intensity (m/z = 45) observed for CO oxidation on Au(332) during a pulsed molecular beam experiment. A constant flux of ¹³CO (p = 2.4 × 10^–6 mbar) and pulses of oxygen atoms (duration 150 s; flux(O) = 8 × 10¹² cm^–2 s^–1) were applied.⁴³⁵ (A) Reproduced with permission from ref (434). Copyright 2007 Springer Nature. (B) Prepared by us from data in ref (435).