Adsorption of ethene on Cu(111)

Ethene stabilization on Cu(111) by surface roughness

“…The energy of this mode ͑labeled 7 according to Herzberg 21 ͒ is 118 meV in the gas phase and in solid ethene. [22][23][24] For ethene on Cu͑111͒ with infrared absorption reflection spectroscopy ͑IRRAS͒ and HREELS, the energy of this dipole-active vibration was found to be only slightly lowered to about 112 meV, 5,25 where both of the measurements were performed at 90 K. The latter value might be of importance since the desorption of ethene from the Cu͑111͒ terraces takes place at 91-95 K. 2 At the bottom of Fig. 1 the spectra of ethene on pristine Cu͑111͒ are shown captured in specular as well as in offspecular geometries.…”

“…Ethene is interesting for its importance in reactions such as dehydrogenation, epoxidation, or cracking. It is known from previous publications that exposure of ethene to low-Miller index Cu surfaces at sufficiently low temperature and under UHV conditions gives rise to a reversible physisorbed layer, [3][4][5] yielding first order desorption kinetics. 5 The molecules are -bonded with the molecular axis parallel to the surface.…”

“…It is known from previous publications that exposure of ethene to low-Miller index Cu surfaces at sufficiently low temperature and under UHV conditions gives rise to a reversible physisorbed layer, [3][4][5] yielding first order desorption kinetics. 5 The molecules are -bonded with the molecular axis parallel to the surface. For Cu͑111͒ they are in cross bridge sites with the C-C axis pointing toward adjacent threefold fcc and hcp sites 5,6 and form a disordered layer 5 which exhibits a single desorption state in temperature programmed desorption ͑TPD͒ with a maximum desorption rate around 105 K, depending on coverage, 5,7 in reasonable agreement with our estimate of the desorption temperature of 91-95 K. 2 Ethene adsorption at metal surfaces is a rather complex phenomenon because of a number of subtle factors determining the process, surface defects being one of them.…”

Tailoring specific adsorption sites by alloying: adsorption of unsaturated organic molecules on alloy surfaces

“…The relatively high desorption temperature and the fact that only single Pt atoms are available on the Cu 3 Pt(111) surface suggest that indeed the desired metallacycle may have formed. A mixed adsorption site can be ruled out at this point since the adsorption of ethene on Cu(111) is so weak [43] compared to Pt(111). The picture becomes even clearer when the HREELS spectra in figure 4 are considered.…”

Enhanced Infrared Absorption of SERS-Active Lines of Ethylene on Cu

“…4, 1471-1476 (2001) In this paper we present and discuss our IR spectroscopic results on ethylene adsorption on ultrathin copper films on KBr(001). Ethylene is known to adsorb via p-bonding on Cu(111) [7] and Cu(100) [8] with the molecular plane parallel to the surface. For Cu(110) the ethylene molecules should also lie flatly on the surface but it is not known whether the molecule is situated on top or at a twofold bridge site of the Cu-ridges in [110] direction [9].…”