Evolution and ion kinetics of a XUV-induced nanoplasma in ammonia clusters
Abstract
High-intensity extreme ultraviolet (XUV) pulses from a free-electron laser can be used to create a nanoplasma in clusters. In Ref. [Michiels et al. PCCP, 2020; 22: 7828-7834] we investigated the formation of excited states in an XUV-induced nanoplasma in ammonia clusters. In the present article we expand our previous study with a detailed analysis of the nanoplasma evolution and ion kinetics. We use a time-delayed UV laser as probe to ionize excited states of H and H in the XUV-induced plasma. Employing covariance mapping techniques, we show that the correlated emission of protons plays an important role in the plasma dynamics. The time-dependent kinetic energy of the ions created by the probe laser is measured, revealing the charge neutralization of the cluster happens on a sub-picosecond timescale. Furthermore, we observe ro-vibrationally excited molecular hydrogen ions H being ejected from the clusters. We rationalize our data through a qualitative model of a finite-size non-thermal plasma.
Keywords
Cite
@article{arxiv.2010.09873,
title = {Evolution and ion kinetics of a XUV-induced nanoplasma in ammonia clusters},
author = {R. Michiels and A. C. LaForge and M. Bohlen and C. Callegari and A. Clark and A. von Conta and M. Coreno and M. Di Fraia and M. Drabbels and P. Finetti and M. Huppert and V. Oliver and O. Plekan and K. C. Prince and S. Stranges and H. J. Wörner and F. Stienkemeier},
journal= {arXiv preprint arXiv:2010.09873},
year = {2021}
}