He-atom scattering from MgO(100): calculating diffraction peak intensities with a semi ab initio potential

Area of Science:

• Surface science
• Atomic and molecular physics
• Computational chemistry

Background:

• Helium (He) atom scattering is a powerful technique for investigating surface properties.
• Accurate He-surface interaction potentials are crucial for interpreting scattering data.
• Previous models often underestimated the well depth of these potentials.

Purpose of the Study:

• To develop an efficient and accurate model for He-atom scattering.
• To improve the calculation of He-surface interaction potentials from first principles.
• To enhance the quantitative description of dynamical processes at surfaces.

Main Methods:

• Calculating He-surface interaction potentials using second-order Rayleigh-Schrödinger many-body perturbation theory.
• Fitting the potential using pairwise interaction potentials and upscaling the attractive part.
• Employing the close-coupling method to compute diffraction patterns.

Main Results:

• Achieved quantitative agreement between computed and observed binding energy for the He-MgO(100) system.
• Successfully reproduced diffraction intensities for He-MgO(100).
• Developed an improved potential that compensates for underestimation in perturbation theory.

Conclusions:

• The developed model provides a more accurate description of He-atom scattering.
• The enhanced potential significantly improves the quantitative analysis of surface dynamics.
• This work is expected to advance the application of He scattering in surface science.