Journal
NEW JOURNAL OF PHYSICS
Volume 23, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/abf7f9
Keywords
imaging; nanoplasma; helium nanodroplets; photoionization
Categories
Funding
- Deutsche Forschungsgemeinschaft (DFG) [MU 2347/12-1, STI 125/22-2]
- Carlsberg Foundation
- SPARC Programme, MHRD, India
- European Union [GINOP-2.3.6-15-2015-00001]
- European Regional Development Fund
- Basque Government [IT1254-19]
- Spanish Ministerio de Economia y Competividad [CTQ2015-67660-P]
- EDRF
- ESF
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This study presents single-shot electron velocity-map images of nanoplasmas generated from doped helium nanodroplets and neon clusters by intense laser pulses, revealing different signal types depending on cluster size. The inner electrons show a nearly circular shape and follow a simple power-law dependence, while the presence of an external electric field significantly affects the evolution of the nanoplasma.
We present single-shot electron velocity-map images of nanoplasmas generated from doped helium nanodroplets and neon clusters by intense near-infrared and mid-infrared laser pulses. We report a large variety of signal types, most crucially depending on the cluster size. The common feature is a two-component distribution for each single-cluster event: a bright inner part with nearly circular shape corresponding to electron energies up to a few eV, surrounded by an extended background of more energetic electrons. The total counts and energy of the electrons in the inner part are strongly correlated and follow a simple power-law dependence. Deviations from the circular shape of the inner electrons observed for neon clusters and large helium nanodroplets indicate non-spherical shapes of the neutral clusters. The dependence of the measured electron energies on the extraction voltage of the spectrometer indicates that the evolution of the nanoplasma is significantly affected by the presence of an external electric field. This conjecture is confirmed by molecular dynamics simulations, which reproduce the salient features of the experimental electron spectra.
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