Selective excitation of vibrations in a single molecule

Yang Luo (), Shaoxiang Sheng, Michele Pisarra, Alberto Martin-Jimenez, Fernando Martin (), Klaus Kern and Manish Garg ()
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Yang Luo: Max Planck Institute for Solid State Research
Shaoxiang Sheng: Max Planck Institute for Solid State Research
Michele Pisarra: Università della Calabria
Alberto Martin-Jimenez: Max Planck Institute for Solid State Research
Fernando Martin: Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA Nano), Faraday 9, Cantoblanco
Klaus Kern: Max Planck Institute for Solid State Research
Manish Garg: Max Planck Institute for Solid State Research

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract The capability to excite, probe, and manipulate vibrational modes is essential for understanding and controlling chemical reactions at the molecular level. Recent advancements in tip-enhanced Raman spectroscopies have enabled the probing of vibrational fingerprints in a single molecule with Ångström-scale spatial resolution. However, achieving controllable excitation of specific vibrational modes in individual molecules remains challenging. Here, we demonstrate the selective excitation and probing of vibrational modes in single deprotonated phthalocyanine molecules utilizing resonance Raman spectroscopy in a scanning tunneling microscope. Selective excitation is achieved by finely tuning the excitation wavelength of the laser to be resonant with the vibronic transitions between the molecular ground electronic state and the vibrational levels in the excited electronic state, resulting in the state-selective enhancement of the resonance Raman signal. Our approach contributes to setting the stage for steering chemical transformations in molecules on surfaces by selective excitation of molecular vibrations.

Date: 2024
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DOI: 10.1038/s41467-024-51419-1

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