Journal
PHYSICAL REVIEW LETTERS
Volume 94, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.94.036106
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Normal incidence x-ray standing wave experiments and density functional theory reveal that 3,4,9,10-perylene-tetracarboxylic-dianhydride chemisorbs on Ag(111) in a nonplanar but vertically distorted configuration. The carboxylic O atoms are 0.18+/-0.03 A closer to the surface than the perylene core. The distortion is related to weak, local bonds between carboxylic O atoms and the Ag surface which are coupled-through charge transfer into the former lowest unoccupied molecular orbital-to the primary, extended chemisorption bond via the perylene skeleton.
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