Journal
PHYSICAL REVIEW LETTERS
Volume 115, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.076101
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Funding
- National Grid Infrastructure MetaCentrum [LM2010005]
- DFG
- GACR [Sche 384/26-2, RE2669/4, 14-16963J]
- Volkswagen foundation
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Kelvin probe force spectroscopy was used to characterize the charge distribution of individual molecules with polar bonds. Whereas this technique represents the charge distribution with moderate resolution for large tip-molecule separations, it fails for short distances. Here, we introduce a novel local force spectroscopy technique which allows one to better disentangle electrostatic from other contributions in the force signal. It enables one to obtain charge-related maps at even closer tip-sample distances, where the lateral resolution is further enhanced. This enhanced resolution allows one to resolve contrast variations along individual polar bonds.
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