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[en] -functionalized tips are used to probe molecules on Cu(111) with scanning tunneling and atomic force microscopy. Distinct and complex intramolecular contrasts are found. Maximal attractive forces are observed when for both molecules a [6,6] bond faces a hexagon of the other molecule. Density functional theory calculations including parameterized van der Waals interactions corroborate the observations. (paper)
Journal
Nanotechnology (Print); ISSN 0957-4484; 
; v. 26(44); [6 p.]
; v. 26(44); [6 p.]