Full Quantum Calculations of the Diffusion Rate of Adsorbates

Abstract

The dynamical structure factor S(q, E) related to the scattering of particles on mobile adsorbates is evaluated quantum mechanically from the formula proposed by van Hove (Phys. Rev. 95: 249–262, 1954) using eigenfunctions and eigenvalues obtained with the Multiconfiguration Time Dependent Hartree method. Three different one dimensional models for the CO/Cu(100) system and a three dimensional model for H/Pd(111) are investigated. Results are discussed in connection with recent 3He spin echo experiments reported in the literature.