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High intensity XUV radiation from a free-electron (FEL) was used to create ananoplasma inside ammonia clusters with the intent of studying the resultingelectron-ion interactions and their interplay with plasma evolution. In aplasma-like state, electrons with kinetic energy lower than the localcollective Coulomb potential of the positive ionic core are trapped in thecluster and take part in secondary processes (e.g. electron-impactexcitation/ionization and electron-ion recombination) which lead to subsequentexcited and neutral molecular fragmentation. Using a time-delayed UV laser, thedynamics of the excited atomic and molecular states are probed from -0.1 ps to18 ps. We identify three different phases of molecular fragmentation that areclearly distinguished by the effect of the probe laser on the ionic andelectronic yield. We propose a simple model to rationalize our data and furtheridentify two separate channels leading to the formation of excited hydrogen.

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