Spin-polarized ion scattering spectroscopy of CCl4 adsorption on Fe(001) surfaces

Comparison of chlorine and oxygen adsorption on the ferromagnetic Fe(001) surface: Density-functional theory study

“…E ad is the calculated adsorption energy per one adatom. Let us turn now to the spin-polarized ion-scattering spectroscopy experiments [7,8]. As mentioned above, the negative asymmetry of the iron signal is consistent with the assumption that mainly LDOS from vicinity of E F contribute.…”

“…Later measurements [6] challenge this model: Some form(s) of surface iron chloride is formed, perhaps together with some amount of CCl 2 fragments. It seems that all the experiments agree [7] that on Fe(0 0 1), chlorine resides at the four-fold (hollow) positions or close to them. Let us remark that, based on previous experimental and theoretical experience, hollow adsorption sites (for adsorbates of ''reasonable size" and not for too large coverage, at least) represent the most likely sites for atomic adsorption at the (0 0 1) face.…”

“…For Cl signal, however, virtually zero asymmetry is found in the Ref. [7]. The Authors suggest that absence of the chlorine magnetization might explain the result.…”

“…Quite recently, deposition of oxygen on Fe(0 0 1) has been studied [7,8] by the newly developed element selective spin-polarized ion-scattering spectroscopy with He þ ions. It has been found that signal from both the surface Fe and O atoms, respectively, shows negative spin asymmetry, i.e.…”

Theoretical insight into chlorine adsorption on the Fe(100) surface

“…As a model of these chlorinated hydrocarbons, it has been demonstrated that carbon tetrachloride (CCl 4 ) adsorbs dissociatively on iron surfaces to form a thin film of chlorine overlayers together with CCl 2 fragments and unidentified forms of iron chlorides. 6 While the adsorption of chlorine on the low-index copper surfaces was investigated in detail, [7][8][9] there have been few studies on the chemisorptions of chlorine on iron surfaces. The pioneering work by Dowben and Jones 10 found that interaction of chlorine with Fe(100) ceased upon the formation of a chemisorbed layer that corresponds to a c(2 Â 4) pattern.…”