• DOI:10.1039/D0CP00669F
• Corpus ID: 212675248

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

@article{Michiels2020TimeresolvedFO,
  title={Time-resolved formation of excited atomic and molecular states in XUV-induced nanoplasmas in ammonia clusters.},
  author={Rupert Michiels and Aaron C. LaForge and Matthias Bohlen and Carlo Callegari and Andrew Clark and Aaron von Conta and Marcello Coreno and Michele Di Fraia and Marcel Drabbels and Paola Finetti and Martin Huppert and V. Oliver and Oksana Plekan and Kevin Charles Prince and Stefano Stranges and V{\'i}t Svoboda and Hans Jakob W{\"o}rner and Frank Stienkemeier},
  journal={Physical chemistry chemical physics : PCCP},
  year={2020}
}

• R. Michiels, A. LaForge, +15 authors F. Stienkemeier
• Published 12 March 2020
• Physics
• Physical chemistry chemical physics : PCCP

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.