Single-molecule tip-enhanced Raman spectroscopy(TERS)has emerged as an important technique for structural analysis at sub-molecular *** in this work,we report a TERS study of an isolated free-base porphyrin molecule a...
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Single-molecule tip-enhanced Raman spectroscopy(TERS)has emerged as an important technique for structural analysis at sub-molecular *** in this work,we report a TERS study of an isolated free-base porphyrin molecule adsorbed on the Ag(100)surface at cryogenic temperature(~7 K).Site-dependent TERS spectra reveal distinct local vibrational information for the chemical constituents within a single ***,distinct spatial features among different Raman peaks can be resolved from the TERS mapping *** images are found to associate with related vibrational modes,enabling to resolve the mode associated with N-H bonds at the sub-nanometer *** study will provide deep insights into the symmetry of adsorption configurations and local vibrational information within a single molecule.
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