W. Liang et al., ELECTRONIC ORIGIN OF SCANNING-TUNNELING-MICROSCOPY IMAGES AND CARBON SKELETON ORIENTATIONS OF NORMAL-ALKANES ADSORBED ON GRAPHITE, Advanced materials, 5(11), 1993, pp. 817-821
STM images of organic insulating molecules adsorbed on conducting subs
trates can only be understood if their electronic origin is known. Ima
ges of normal alkanes on graphite (n-C36H74 is shown in the Figure) ar
e interpreted here on the basis of their partial electron density plot
s rho(r0,e(f)), demonstrating that the linear alkanes can ''tumble'' a
nd change their orientation with respect to the graphite surface.