Schematic illustration of tip-enhanced VSFG spectroscopy. (IMAGE)

National Institutes of Natural Sciences

Schematic illustration of tip-enhanced VSFG spectroscopy.

Caption

 (a) Schematic illustration of tip-enhanced VSFG spectroscopy. Tunable mid-IR- and near-IR-pulsed lasers are focused into the nanojunction between the STM tip and sample substrate, enabling the detection of VSFG signals from a very limited number of molecules located within the nanogap. (b) Observed VSFG spectra with fitted curves shown in black. (c) Extracted imaginary component of the vibrational resonant contribution of the second-order susceptibility ( Im[χR(2)(ωIR)]). Negative values indicate that the terminal methyl groups are oriented with hydrogen atoms directed away from the substrate. 

Credit

Atsunori Sakurai

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