Effect of thermally induced surface defects on the optical anisotropy of Ag(110)

Estimating the range of influence of point defects on Cu (110) surface states

“…Surface-state-related RAS features such as this are well known to be highly sensitive to molecular adsorption, [8][9][10] temperature, 10-12 surface alloying, 13 and the creation of surface defects via heating 14 and ion bombardment at low temperatures. 10 It has been suggested by Sun et al, in studies focusing on the adsorption of CO (Ref.…”

Simulating the temperature dependence of surface state contributions to reflection anisotropy spectral features

“…2 Simulating the temperature dependence of the surface state transitions To simulate the effect of temperature on e 00 s in the energy regions around 1.7 and 2.1 eV for Ag and Cu (110), respectively, we adopt the model developed by Gerlach et al [8] to determine the temperature dependence of the 1.7 eV SHG signal from Ag (110), and used in recent RAS studies of noble metal surfaces [3,7]. The parabolic shape of the occupied and unoccupied states are described using the expression…”

“…[2]. In recent work focusing on Ag (110) [3], we have simulated the effect of thermally created surface defects on the intensity of the surface state-derived 1.7 eV RAS peak and have shown that individual adatoms have the ability to quench the contribution to the intensity of this feature over a significant surrounding area. Similarly, Sun et al [4,5] have revealed that molecular adsorbates induce an equivalent effect on the 2.1 eV Cu (110) RAS peak.…”

“…These studies demonstrate that surface state related RAS features have the potential to be used for accurately monitoring a variety of surface kinetic processes such as the creation of thermal ad atoms from step edges and the ordering of molecular adsorbates. However, to enable a highly rigorous quantitative analysis of such phenomena using RAS, significant advances in the model described in our recent study [3] are required, in particular an incorporation of the effect that complex defect or adsorbate interactions, such as the formation of islands, have on the intensity of surface state peaks, which are likely to become more pronounced with increasing temperature. In this study however, we will set aside the effect that thermally created defects have on the intensities of surface state RAS peaks and focus solely on simulating the effect of temperature on the intrinsic properties of the surface state transitions involved in the formation of two different RAS peaks.…”