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19 April 2024

» pubmed » pmid16090951

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Emission of thermally activated electrons from rare gas clusters irradiated with intense VUV light pulses from a free electron laser
T Laarmann ; M Rusek ; H Wabnitz ; J Schulz ; A R B de Castro ; P Gürtler ; W Laasch ; T Möller ;
Date:	5 Aug 2005
Journal:	Phys Rev Lett, 95 (6), 063402
Abstract:	The ionization dynamics of Ar and Xe clusters irradiated with intense vacuum ultraviolet light from a free-electron laser is investigated using photoelectron spectroscopy. Clusters comprising between 70 and 900 atoms were irradiated with femtosecond pulses at 95 nm wavelength (approximately 13 eV photon energy) and a peak intensity of approximately 4 x 10(12) W/cm2. A broad thermal distribution of emitted electrons from clusters with a maximum kinetic energy up to 30-40 eV is observed. The observation of relatively low-energy photoelectrons is in good agreement with calculations using a time-dependent Thomas-Fermi model and gives experimental evidence of an outer ionization process of the clusters, due to delayed thermoelectronic emission.
Source:	PubMed, pmid16090951
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