The final world model contains only gravonons, gravitons and a scalar matter field. The gravonons are localized in the environment of the massive particles which generate them. The solution of the Schroedinger equation for the world model yields matter fields which are localized in the 4 dimensional subspace.

Atom and molecule localization is governed by the chooser mechanism for the selection of the localization site. The site selection is on the basis of minor energy and gravonon differences. The changes from one localization site to a neighbouring one take place in a telegraph-signal like manner.

All experimental findings on adsorbate quantum diffusion are explained in a deterministic way as a consequence of the time development of the wave function in configuration space according to Schroedinger's equation without the need of introducing a statistical interpretation or the collapse concept.

Weight of adsorbate wave packet on an adsorption site as a function of time

G. Doyen and D. Drakova, arXiv: 1408.2716 [quant-ph] 25 Apr 2012.

G. Doyen and D. Drakova, Foundations of Physics ** 45**, pp 959-999 (2015).