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Time-resolved formation of excited atomic and molecular states in XUV-induced nanoplasmas in ammonia clusters.

  • Michiels R Institute of Physics, University of Freiburg, 79104 Freiburg, Germany. rupert.michiels@physik.uni-freiburg.de.
  • LaForge AC Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA.
  • Bohlen M Institute of Physics, University of Freiburg, 79104 Freiburg, Germany. rupert.michiels@physik.uni-freiburg.de.
  • Callegari C Elettra-Sincrotrone Trieste S.C.p.A., 34149 Basovizza, Trieste, Italy.
  • Clark A Laboratory of Molecular Nanodynamics, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
  • von Conta A Laboratorium für Physikalische Chemie, ETH Zürich, 8093 Zürich, Switzerland.
  • Coreno M ISM-CNR, Istituto di Struttura della Materia, LD2 Unit, 34149 Trieste, Italy.
  • Di Fraia M Elettra-Sincrotrone Trieste S.C.p.A., 34149 Basovizza, Trieste, Italy.
  • Drabbels M Laboratory of Molecular Nanodynamics, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
  • Finetti P Elettra-Sincrotrone Trieste S.C.p.A., 34149 Basovizza, Trieste, Italy.
  • Huppert M Laboratorium für Physikalische Chemie, ETH Zürich, 8093 Zürich, Switzerland.
  • Oliver V Laboratory of Molecular Nanodynamics, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
  • Plekan O Elettra-Sincrotrone Trieste S.C.p.A., 34149 Basovizza, Trieste, Italy.
  • Prince KC Elettra-Sincrotrone Trieste S.C.p.A., 34149 Basovizza, Trieste, Italy.
  • Stranges S Department of Chemistry and Drug Technologies, University Sapienza, 00185 Rome, Italy, and Tasc IOM-CNR, Basovizza, Trieste, Italy.
  • Svoboda V Laboratorium für Physikalische Chemie, ETH Zürich, 8093 Zürich, Switzerland.
  • Wörner HJ Laboratorium für Physikalische Chemie, ETH Zürich, 8093 Zürich, Switzerland.
  • Stienkemeier F Institute of Physics, University of Freiburg, 79104 Freiburg, Germany. rupert.michiels@physik.uni-freiburg.de.
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  • 2020-04-06
Published in:
  • Physical chemistry chemical physics : PCCP. - 2020
Physical and Theoretical Chemistry
General Physics and Astronomy
English High intensity XUV radiation from a free-electron laser (FEL) was used to create a nanoplasma inside ammonia clusters with the intent of studying the resulting electron-ion interactions and their interplay with plasma evolution. In a plasma-like state, electrons with kinetic energy lower than the local collective Coulomb potential of the positive ionic core are trapped in the cluster and take part in secondary processes (e.g. electron-impact excitation/ionization and electron-ion recombination) which lead to subsequent excited and neutral molecular fragmentation. Using a time-delayed UV laser, the dynamics of the excited atomic and molecular states are probed from -0.1 ps to 18 ps. We identify three different phases of molecular fragmentation that are clearly distinguished by the effect of the probe laser on the ionic and electronic yield. We propose a simple model to rationalize our data and further identify two separate channels leading to the formation of excited hydrogen.
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  • English
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green
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https://susi.usi.ch/global/documents/188416
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