Angular distribution of emitted electrons in sodium clusters: A semiclassical approach

Journal Article · Tue Apr 01 04:00:00 EST 2003 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.67.043202· OSTI ID:20633994

Giglio, E; Reinhard, P -G; Suraud, E ^[1]

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1. CIRIL, rue Claude Bloch, BP 5133, F-14070 Caen Cedex 05 (France)

We present a theoretical study of the angular distribution of emitted electrons of a sodium cluster, irradiated by short and intense laser pulses. While the polarization of the excitation field tends to focus a directional emission, the dynamical correlations tend to thermalize the electrons, giving rise to a more isotropic ionization. The competition between these processes is investigated using a semiclassical model Vlasov-Uehling-Uhlenbeck, where the dynamical correlations are taken in account by the electron-electron correlations in the Markovian approximation, the widely known Uehling-Uhlenbeck collision term. The results are compared to a semiclassical pure mean-field propagation (Vlasov equation) to work out the influence of dynamical correlations on the angular distribution of the electron emission. The trends with laser intensity and frequency are explored. The time evolution of the angular distributions shows that direct emission processes are stronger in the early phase of the processs, while isotropic thermal emission dominates later.

• OSTI ID: 20633994
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 4 Vol. 67; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
ATOM COLLISIONS
ATOMIC CLUSTERS
BOLTZMANN-VLASOV EQUATION
ELECTRON CORRELATION
ELECTRON EMISSION
ELECTRONS
EXCITATION
IONIZATION
LASER RADIATION
MARKOV PROCESS
MEAN-FIELD THEORY
PHOTOEMISSION
POLARIZATION
PULSES
SEMICLASSICAL APPROXIMATION
SODIUM