Phys. Rev. Lett. 95, 063402 (2005) [4 pages]Emission of Thermally Activated Electrons from Rare Gas Clusters Irradiated with Intense VUV Light Pulses from a Free Electron LaserReceived 14 January 2005; published 5 August 2005 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 (∼13 eV photon energy) and a peak intensity of ∼4×1012 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. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.063402
DOI:
10.1103/PhysRevLett.95.063402
PACS:
36.40.Gk, 52.50.Jm
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