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Electron-phonon coupling and vibrational properties of size-selected linear carbon chains by resonance Raman scattering

Author

Listed:
  • P. Marabotti

    (Politecnico di Milano via Ponzio 34/3)

  • M. Tommasini

    (Politecnico di Milano Piazza Leonardo da Vinci 32)

  • C. Castiglioni

    (Politecnico di Milano Piazza Leonardo da Vinci 32)

  • P. Serafini

    (Politecnico di Milano via Ponzio 34/3)

  • S. Peggiani

    (Politecnico di Milano via Ponzio 34/3)

  • M. Tortora

    (Elettra Sincrotrone Trieste)

  • B. Rossi

    (Elettra Sincrotrone Trieste)

  • A. Li Bassi

    (Politecnico di Milano via Ponzio 34/3)

  • V. Russo

    (Politecnico di Milano via Ponzio 34/3)

  • C. S. Casari

    (Politecnico di Milano via Ponzio 34/3)

Abstract

UV resonance Raman spectroscopy of size-selected linear sp-carbon chains unveils vibrational overtones and combinations up to the fifth order. Thanks to the tunability of the synchrotron source, we excited each H-terminated polyyne (HCnH with n = 8,10,12) to the maxima of its vibronic absorption spectrum allowing us to precisely determine the electronic and vibrational structure of the ground and excited states for the main observed vibrational mode. Selected transitions are shown to enhance specific overtone orders in the Raman spectrum in a specific way that can be explained by a simple analytical model based on Albrecht’s theory of resonance Raman scattering. The determined Huang–Rhys factors indicate a strong and size-dependent electron-phonon coupling increasing with the sp-carbon chain length.

Suggested Citation

  • P. Marabotti & M. Tommasini & C. Castiglioni & P. Serafini & S. Peggiani & M. Tortora & B. Rossi & A. Li Bassi & V. Russo & C. S. Casari, 2022. "Electron-phonon coupling and vibrational properties of size-selected linear carbon chains by resonance Raman scattering," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-32801-3
    DOI: 10.1038/s41467-022-32801-3
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    1. Johannes Zirzlmeier & Stephen Schrettl & Jan C. Brauer & Emmanuel Contal & Laurent Vannay & Éric Brémond & Eike Jahnke & Dirk M. Guldi & Clémence Corminboeuf & Rik R. Tykwinski & Holger Frauenrath, 2020. "Optical gap and fundamental gap of oligoynes and carbyne," Nature Communications, Nature, vol. 11(1), pages 1-10, December.
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