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Electronic Transitions Responsible for C60+ Diffuse Interstellar Bands.

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Fullerenes like C60+ are confirmed carriers of diffuse interstellar bands (DIBs). This study reveals their transitions originate from non-Franck-Condon regions and vibronic excitations, not simple electronic states.

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Area of Science:

  • Astrochemistry
  • Quantum Chemistry
  • Spectroscopy

Background:

  • Diffuse interstellar bands (DIBs) are unexplained absorption features in space.
  • C60+ (buckminsterfullerene cation) is the first confirmed carrier of several DIBs.
  • The specific electronic transitions responsible for C60+ DIBs remain unclear.

Purpose of the Study:

  • To elucidate the nature of electronic transitions in C60+ responsible for observed DIBs.
  • To investigate the role of Jahn-Teller distortion and vibronic coupling in C60+ DIBs.
  • To accurately assign specific DIB wavelengths to C60+ transitions.

Main Methods:

  • Utilized advanced electronic structure calculations.
  • Simulated transitions to excited electronic states of C60+.
  • Analyzed the influence of Jahn-Teller distortion and vibronic interactions.

Main Results:

  • Ruled out simple electronic transitions to excited 2E1g states or spin-orbit components.
  • Attributed strong DIBs (9632, 9577 Å) to cold excitations from the ground state's non-Franck-Condon region.
  • Assigned weak DIBs (9428, 9365 Å) to vibronic transitions involving low-energy modes.

Conclusions:

  • The observed C60+ DIBs are explained by complex excitations beyond simple electronic transitions.
  • Jahn-Teller distortion and vibronic coupling are crucial for understanding C60+ DIB spectra.
  • This work provides a framework for interpreting DIBs from molecular carriers.