High-resolution scanning tunneling and atomic force microscopy of stereochemically resolved dibenzo[a,h]thianthrene molecules

Pavlicek, Niko and Herranz-Lancho, Coral and Fleury, Benoit and Neu, Mathias and Niedenfuehr, Judith and Ruben, Mario and Repp, Jascha (2013) High-resolution scanning tunneling and atomic force microscopy of stereochemically resolved dibenzo[a,h]thianthrene molecules. PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, 250 (11). pp. 2424-2430. ISSN 0370-1972, 1521-3951

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Abstract

Recently, we reported on the bistable configurational switching of dibenzo[a,h]thianthrene (DBTH) molecules adsorbed on NaCl using combined low-temperature scanning tunneling and atomic force microscopy (STM/AFM). Here, we discuss the intra-molecular contrast in AFM images of the molecules as a function of the tip-molecule distance. Our experiments show that ridges in the frequency shift do not necessarily correlate with chemical bonds in this case of a non-planar molecule. To explain this finding we compare images acquired at different tip-molecule distances to the calculated electron density of the molecules obtained from density functional theory calculations (DFT). In addition, we analyze the probability of finding different configurations after adsorption onto the surface. DBTH molecules in two configurations probed by a CO-functionalized tip. Insets show AFM (left) and STM (right) images of a U molecule.

Item Type: Article
Uncontrolled Keywords: PROBE MICROSCOPY; SINGLE-MOLECULE; THIANTHREN; CRYSTAL; charge density; contrast mechanisms; scanning probe microscopy; thianthrene
Subjects: 500 Science > 530 Physics
Divisions: Physics > Institute of Experimental and Applied Physics > Chair Professor Giessibl > Group Jascha Repp
Depositing User: Dr. Gernot Deinzer
Date Deposited: 25 Mar 2020 12:37
Last Modified: 25 Mar 2020 12:37
URI: https://pred.uni-regensburg.de/id/eprint/15696

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