Scanning tunneling microscopy.

Real time observation of molecules adsorbed at the solid liquid interface.

The STM tip has been used to initiate chemical reactions between molecules adsorbed at the solid-liquid interface. In the image above you can see where polymerisation has been induced between monomer units adsorbed on graphite.

Spatial distribution for probability of the polymerization reaction at various bias voltages (a) without and (b) with N(CH3)4ClO4.