Electrically-driven vibronic spectroscopy with sub-molecular resolution

2016/12/14 by Benjamin Doppagne, Michael C. Chong, Etienne Lorchat +6 · 1 citation
Physics and Astronomy · #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevlett.118.127401

published as Phys. Rev. Lett. 118, 127401 (2017)

arxiv created 2016/12/14 · arxiv updated 2017/03/29

Abstract

A scanning tunneling microscope is used to generate the electroluminescence of phthalocyanine molecules deposited on NaCl/Ag(111). Photon spectra reveal an intense emission line at 1.9 eV that corresponds to the fluorescence of the molecules, and a series of weaker red-shifted lines. Based on a comparison with Raman spectra acquired on macroscopic molecular crystals, these spectroscopic features can be associated to the vibrational modes of the molecules and provide a detailed chemical fingerprint of the probed species. Maps of the vibronic features reveal sub- molecularly-resolved structures whose patterns are related to the symmetry of the probed vibrational modes.

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