He atom scattering from ZnO surfaces: calculation of diffraction peak intensities using the close-coupling approach

Area of Science:

• Surface Science
• Computational Chemistry
• Materials Science

Background:

• Understanding surface structures and interactions is crucial in materials science.
• Helium (He) scattering is a sensitive probe of surface properties.
• Previous models for He-ZnO interactions were limited.

Purpose of the Study:

• To develop and validate a new potential model for simulating He beam scattering off ZnO surfaces.
• To investigate the influence of water adsorption on He-ZnO surface interactions.
• To enable accurate prediction of surface and adsorbate structures.

Main Methods:

• Simulated He beam scattering using a novel potential model and close-coupling formalism.
• Calculated effective corrugation functions via density functional theory (DFT) within the Esbjerg-Nørskov approximation.
• Constructed a potential model combining a corrugated Morse potential and a semi-empirical attractive term.

Main Results:

• The developed potential model accurately reproduced experimental diffraction intensities, with agreement within approximately 10%.
• The simulations successfully accounted for the effects of water adsorption on the ZnO(1010) surface.
• Effective corrugation functions were derived for He-H2O/ZnO(1010) systems.

Conclusions:

• The new potential model and simulation approach are highly effective for analyzing He diffraction from complex surfaces.
• This method provides a reliable tool for verifying theoretically proposed surface and adsorbate structures.
• The study advances the capability to probe and understand surface phenomena in materials science.