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Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
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Interatomic and intermolecular decay processes in quantum fluid clusters.

A C LaForge1, L Ben Ltaief2, S R Krishnan3

  • 1Department of Physics, University of Connecticut, Storrs, CT 06269, United States of America.

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|November 7, 2024
PubMed
Summary
This summary is machine-generated.

Superfluid helium nanodroplets reveal correlated electronic decay phenomena under extreme ultraviolet radiation. This research enhances understanding of ionizing radiation effects on condensed matter, including biological systems.

Keywords:
Helium nanodropletsfree-electron lasersinteratomic coulombic decayphotoionizationquantum fluidsynchrotron spectroscopy

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Area of Science:

  • Atomic and Molecular Physics
  • Condensed Matter Physics
  • Quantum Fluids

Background:

  • Superfluid helium nanodroplets exhibit unique quantum fluid properties.
  • These droplets serve as ideal systems for studying non-local electronic decay processes.

Purpose of the Study:

  • To review interatomic and intermolecular correlated electronic decay phenomena in helium nanodroplets under extreme ultraviolet (UV) radiation.
  • To explore energy and charge transfer mechanisms leading to ionization and low-energy electron emission.

Main Methods:

  • Investigation of light-matter interactions using advanced experimental and computational techniques.
  • Utilizing ultrashort pulses from free-electron lasers to resolve ultrafast dynamics.
  • Analysis of processes like interatomic/intermolecular Coulombic decay and electron transfer-mediated decay.

Main Results:

  • Detailed examination of non-local electronic decay processes in superfluid helium.
  • Observation of ionization and low-kinetic energy electron emission resulting from energy/charge transfer.
  • High spectral and temporal precision in resolving electronic decay dynamics.

Conclusions:

  • Helium nanodroplets provide crucial insights into fundamental electronic decay mechanisms.
  • Understanding these processes in helium nanodroplets informs studies on ionizing radiation effects in other condensed-phase and biological systems.
  • Advanced techniques enable precise characterization of quantum fluid dynamics and nanoscale electronic interactions.