Time and Frequency Resolved Nanoscale Chemical Imaging of   Dimercaptostilbene on Silver
  Non-resonant tip-enhanced Raman images of dimercaptostilbene on silver reveal that different vibrational resonances of the reporter are selectively enhanced at different sites on the metal substrate. Sequentially recorded images track molecular diffusion within the diffraction-limited laser spot which illuminates the substrate. In effect, the recorded time resolved (dt = 10 s) pixelated images (25 nm x 8 cm-1) broadcast molecule-local field interactions which take place on much finer scales. 
Patrick Z. El-Khoury, Dehong Hu, Wayne P. Hess
physics.chem-ph physics.optics