Comment:
2.5 L CH3OH was adsorbed onto Pd(111)-(1x1) at 110 K The substrate was cleaned by heating (T = 650 K, time = 20 min, p = 1E-7 Torr O2), Ar+ ion sputtering (Ep = 3 keV, Ip = 2 microamperes, time= 5 T = 300 K) cooling to 110 K and subsequently flashed to 1