Adsorption of small hydrocarbon molecules on Si surfaces: Ethylene on Si(001)

Abstract

The interaction between small unsaturated hydrocarbon molecules of C(2)H(4) with a vicinal silicon (001) surface is studied by means of reflectance anisotropy spectroscopy and analyzed with first principles calculations. Our results confirm that ethylene adsorbs without breaking the silicon dimers. Comparison of theoretical optical spectra with experimental data shows that the C(2)H(4) molecules lay on top of the silicon dimers from low to high coverage. This occurs even though, from a purely energetic point of view, a bridge configuration would be favorable at 1 monolayer coverage

Amphiphilic Block Copolymer for adsorption of Organic Contaminants

“…This suggested that smaller molecules are more easily encapsulated into the hydrophobic vacancy. The similar results were shown to another recent research [21,22]. All the equilibrium concentrations on the PSN 02 adsorbents were lower than those on PSN 01.…”

Electronic and optical properties of acetylene and ethylene on Si(001)

“…Similar features can also be found in the case of ethylene adsorption (see Ref. [33]). The 0.6 eV negative structure in the clean surface spectrum is associated to transition between π and π surface states, de-localized along the dimer rows [34].…”

Test of long-range exchange-correlation kernels of time-dependent density functional theory at surfaces: Application toSi(111)2×1

“…However, a discrepancy occurs as far as the intensity is concerned: the calculated RAS in the visible and UV overestimates the experiment by a factor 3. This is a general feature of RA spectra, [40][41][42] probably due to the presence of multiple domains, steps, surface imperfections, etc. A detailed discussion of this point for Si͑100͒ is given in Ref.…”