Single-molecule imaging and, repositioning of 1,3-butadiene adsorbed on Pd(110) surface

We report here single-molecule imaging and repositioning of 1,3-butadiene molecules adsorbed on a palladium (110) surface by scanning tunneling microscopy (STM) at cryogenic temperature of 4.7 K. The atomically resolved STM images reveal that the adsorbed 1,3-butadiene molecules have two types of adsorption sites, where the molecular axis is oriented along [1 (1) over bar0] (N type) or [001] (R type). Based on the STM images, we determine the adsorption sites of each type. In addition, repositioning of R-type 1,3-butadiene molecules is demonstrated by controlling tip-adsorbate distance and by moving the tip laterally. The target molecules have been laterally moved and simultaneously rotated to change their adsorption sites from R type to N type on the next row.