Dissociative chemisorption of O2 on Cu(110)

Initial sticking probability of O2 on Cu(410)

“…Systematic measurements of the sticking probability are performed with the retarded reflector method of King and Wells [18] (KW in the following) and are affected by an error of ±0.035. None or negligible recombinative oxygen desorption is detected when heating the sample, in agreement with literature [5]. In accord with this, we find a lower value of S 0 when the O 2 exposure is performed on a surface cleaned only by annealing to 900 K than after a complete cleaning cycle.…”

“…For hyperthermal energy, the initial sticking probability, S 0 , scales with translational energy, E i , and it is nearly independent of surface temperature, T, for both surfaces. At thermal energy the picture is, however, more complex since S 0 decreases significantly with T for T > 150 K on Cu(1 1 0) [5] and on sputtered Cu(1 0 0) [8], while it increases on flat Cu(1 0 0) [6]. This phenomenon was explained by the presence of a physisorbed precursor in the first two cases and in terms of phonon assisted adsorption for flat Cu(1 0 0).…”

“…4 the initial sticking probability is plotted vs. E i for three different h. The experimental curve for h = 0°is compared with the corresponding ones for Cu(1 0 0) [6,8] (solid curve) and Cu(1 1 0) [5] (dashed line). We notice that (e) S 0 increases monotonously saturating for higher energies.…”

“…Most investigations concentrated therefore on the high coverage regime required to ignite oxide formation. The initial stages of oxygen adsorption attracted less attention and were limited so far to Cu(1 1 0) [4,5] and to Cu(1 0 0) [6][7][8], thus neglecting the role of defects and under-coordinated sites. However a very recent study on sputtered Cu(1 0 0) [9] and some investigations on the O/Cu(4 1 0) system were performed.…”

RDS investigation of adsorption and surface ordering processes on Cu(110)

“…Especially, the surface related RDS intensity at 2.0 eV is quenched and the peak maximum is shifted to 2.2 eV, i.e., the energy position of the bulk transition. The situation for oxygen adsorption at 11 K is a bit complex, since the oxygen molecules are partially dissociated upon adsorption, therefore, both atomic and molecular oxygen exists on the surface [12,13]. For the chemisorbed atomic species a stronger interaction with the surface electronic structure is expected.…”