UCL logo

UCL Discovery

UCL home » Library Services » Electronic resources » UCL Discovery

Atomic scale friction of molecular adsorbates during diffusion

Lechner, BAJ; De Wijn, AS; Hedgeland, H; Jardine, AP; Hinch, BJ; Allison, W; Ellis, J; (2013) Atomic scale friction of molecular adsorbates during diffusion. Journal of Chemical Physics , 138 (19) 10.1063/1.4804269.

Full text not available from this repository.

Abstract

Experimental observations suggest that molecular adsorbates exhibit a larger friction coefficient than atomic species of comparable mass, yet the origin of this increased friction is not well understood. We present a study of the microscopic origins of friction experienced by molecular adsorbates during surface diffusion. Helium spin-echo measurements of a range of five-membered aromatic molecules, cyclopentadienyl, pyrrole, and thiophene, on a copper(111) surface are compared with molecular dynamics simulations of the respective systems. The adsorbates have different chemical interactions with the surface and differ in bonding geometry, yet the measurements show that the friction is greater than 2 ps-1 for all these molecules. We demonstrate that the internal and external degrees of freedom of these adsorbate species are a key factor in the underlying microscopic processes and identify the rotation modes as the ones contributing most to the total measured friction coefficient. © 2013 AIP Publishing LLC.

Type: Article
Title: Atomic scale friction of molecular adsorbates during diffusion
DOI: 10.1063/1.4804269
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1448112
Downloads since deposit
0Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item