Fig. 6
From: Self-assembly directed one-step synthesis of [4]radialene on Cu(100) surfaces
Controllable successive tip manipulation experiments. a A STM topographic image includes three tetramers. b After a pulse is applied, the tetramer located at the top left corner disappears. c One more tetramer disappears upon further tip pulsing. To conduct the tip manipulation, a voltage pulse of −3.2 V between STM tip and molecules was applied. The image sizes are 22 nm × 22 nm and the scanning parameters are Vb = 1 V, It = 20 pA for all the images
