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Issue 15, 2020
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Time-resolved formation of excited atomic and molecular states in XUV-induced nanoplasmas in ammonia clusters

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Abstract

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.

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

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Supplementary files

Article information


Submitted
06 Feb 2020
Accepted
25 Mar 2020
First published
26 Mar 2020

Phys. Chem. Chem. Phys., 2020,22, 7828-7834
Article type
Paper

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

R. Michiels, A. C. LaForge, M. Bohlen, C. Callegari, A. Clark, A. von Conta, M. Coreno, M. Di Fraia, M. Drabbels, P. Finetti, M. Huppert, V. Oliver, O. Plekan, K. C. Prince, S. Stranges, V. Svoboda, H. J. Wörner and F. Stienkemeier, Phys. Chem. Chem. Phys., 2020, 22, 7828
DOI: 10.1039/D0CP00669F

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