Control and manipulation of small molecules in the scanning tunneling microscope

[摘要] In this thesis methodologies for manipulation and control of two different surface-molecule systems are explored. Thermal effects play a key role in all of the mechanisms studied. The first methodology studied is self-assembly of dimethyl-disulfide on Au(Jll).Conformational change and diffusion of Au-adatom dithiolate complexes are investigated over the temperature range 77 K to 200 K. The second manipulation methodology is non-local manipulation of Si(lll )-7x7: PhCI. Non-local desorption of the chemisorbed moleculesby hole injection is studied in the temperature range 77 K to 293 K, and comparedto previous results on the electron inducedprocess in the same temperature range.It is found that desorption proceeds through the physisorbed state for both carriers, but that there is an additional mechanism which differs depending on the charge carrier. Non-local manipulation of physisorbed chlorobenzene is studied at low temperature, where a new species is found to be created in non-local manipulation experiments at 4.6 K. It is speculated that this is a result of efficient dissociation of the physisorbed molecules.

[发布机构] University:University of Birmingham;Department:School of Physics and Astronomy

[关键词] Q Science;QD Chemistry