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Michael Stadlhofer1, Bernhard Thaler1, Markus Koch1

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Femtosecond pump-probe experiments reveal indium dimer (In2) fragmentation within helium nanodroplets (HeN). This process unexpectedly ejects indium ions (In+) and provides insights into ultrafast molecular dynamics and ionization pathways.

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Area of Science:

  • Physical Chemistry
  • Chemical Physics
  • Ultrafast Spectroscopy

Background:

  • Helium nanodroplets (HeN) are weakly interacting systems ideal for studying isolated molecules.
  • Indium dimers (In2) are model systems for investigating electronic and vibrational dynamics.

Purpose of the Study:

  • To investigate the ultrafast dynamics of indium dimers (In2) solvated in helium nanodroplets (HeN) using femtosecond pump-probe spectroscopy.
  • To elucidate the ionization and fragmentation pathways of In2 within HeN.

Main Methods:

  • Femtosecond pump-probe photoionization experiments.
  • Covariance detection of ejected ions and photoelectrons.
  • Solvation of indium dimers in helium nanodroplets.

Main Results:

  • Observation of unexpected ejection of InHen+ ions (n=1-30) from HeN droplets following In2 excitation.
  • Identification of the ionization pathway as absorption-ionization-dissociation (AID).
  • Revealing vibrational wave packet motion in neutral In2* via the InHen+ signal.

Conclusions:

  • The kinetic energy released during In2 fragmentation allows ions to overcome the HeN binding potential.
  • Electron-ion covariance detection provides a powerful tool for assigning ionization pathways in complex systems.
  • This method offers a complementary observable for studying ultrafast photochemical processes within helium nanodroplets.