Selective Excitation of Vibrations in a Single Molecule
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866911797907292160 |
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| author | Luo, Yang Sheng, Shaoxiang Pisarra, Michele Jimenez, Alberto Martin Martin, Fernando Kern, Klaus Garg, Manish |
| author_facet | Luo, Yang Sheng, Shaoxiang Pisarra, Michele Jimenez, Alberto Martin Martin, Fernando Kern, Klaus Garg, Manish |
| contents | 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 Angstrom-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 sets the stage for steering chemical transformations in molecules on surfaces by selective excitation of molecular vibrations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_09328 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Selective Excitation of Vibrations in a Single Molecule Luo, Yang Sheng, Shaoxiang Pisarra, Michele Jimenez, Alberto Martin Martin, Fernando Kern, Klaus Garg, Manish Optics Chemical Physics 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 Angstrom-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 sets the stage for steering chemical transformations in molecules on surfaces by selective excitation of molecular vibrations. |
| title | Selective Excitation of Vibrations in a Single Molecule |
| topic | Optics Chemical Physics |
| url | https://arxiv.org/abs/2403.09328 |