Fig. 4.

The resonant TERS images of H₂TBPP molecule absorbed on a Ag(111) surface. The excitation energy corresponds to the B_y transition. a, b TERS images of individual degenerate modes of the bands centered around 810 and 1185 cm⁻¹. The schematic representations of molecular vibrations lay on the individual TERS images and the corresponding frequencies (in cm⁻¹) are given in the top left corners. c, d The experimental TERS images (left panel) and simulated TERS images by integrating band width of 20 cm⁻¹ (right panel)