Web Release Date: June 5,
Size-Dependent Angular Distributions of Low-Energy Photoelectrons Emitted from NaCl Nanoparticles
and
Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China, Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, D-14195 Berlin, Germany, and Departments of Chemistry and Physics, University of California, Berkeley, California 94720
Received April 9, 2007
Revised May 14, 2007
Abstract:
Angle-resolved threshold photoelectron spectra are recorded for size-selected beams of sodium chloride nanoparticles (radius = 25-250 nm). The photoelectron angular distributions exhibit a size-dependent asymmetry that is inversely proportional to particle radius. A model of the internal electric field amplitude and the photoelectron escape probability inside the particles reveals that the asymmetry in photoemission arises because the finite dimensions of the particle are comparable to both the photon penetration depth (14-22 nm) and electron escape length (10 nm).
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