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Slow Interatomic Coulombic Decay of Multiply Excited Neon Clusters.

D Iablonskyi1, K Nagaya2, H Fukuzawa1

  • 1Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 980-8577 Sendai, Japan.

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|January 14, 2017
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Summary
This summary is machine-generated.

Intense free electron laser (FEL) radiation excites neon clusters, leading to non-radiative decay. The study reveals interatomic Coulombic decay (ICD) is a slow process, influenced by cluster environment and controllable via FEL intensity.

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Area of Science:

  • Atomic and Molecular Physics
  • Quantum Chemistry
  • Materials Science

Background:

  • Neon clusters (Ne) are model systems for studying excited-state dynamics.
  • Free electron lasers (FELs) provide intense, tunable radiation for probing atomic and molecular systems.
  • Interatomic or intermolecular Coulombic decay (ICD) is a key non-radiative decay pathway in excited atomic and molecular systems.

Purpose of the Study:

  • To investigate the non-radiative decay mechanisms of multiply excited neon clusters.
  • To understand the role of the cluster environment on interatomic Coulombic decay (ICD) dynamics.
  • To explore the influence of free electron laser (FEL) intensity on cluster excitation and decay rates.

Main Methods:

  • Resonant excitation of Ne clusters (∼5000 atoms) using seeded FEL radiation at FERMI.
  • Probing specific sites within the clusters due to precise FEL tunability and narrow bandwidth.
  • Analysis of decay pathways, including interatomic/intermolecular Coulombic decay (ICD) and inelastic electron scattering.

Main Results:

  • Cluster surface atom relaxation occurs via sequential ICD processes.
  • Bulk atom ICD is influenced by the surrounding excited medium through inelastic electron scattering.
  • Cluster excitations relax to atomic states before ICD, indicating a slow decay process (picosecond range).
  • FEL intensity controls the average number of excitations per cluster, enabling coarse tuning of the ICD rate.

Conclusions:

  • The study elucidates the complex decay dynamics of excited neon clusters.
  • ICD in neon clusters is a slow, environmentally dependent process.
  • FEL intensity offers a means to control non-radiative decay rates in atomic clusters.