Secondary-electron emission from porous solids

Details Secondary-electron emission from porous solids Secondary-electron emission from porous solids

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phrva..52..433m&link_type=abstract

Physical Review A (Atomic, Molecular, and Optical Physics), Volume 52, Issue 1, July 1995, pp.433-438

Physics

6

Electron Impact: Secondary Emission, Interplanetary Dust And Gas, Magnetohydrodynamics And Plasmas

Scientific paper

Porous structure can strongly change the electric behavior of material submitted to bombardment by energetic electrons: strong electric fields (108 V/m) can grow within the pores, because of the small sizes of these pores. We give a model of porous material that enables us to emphasize and illustrate the enhancement of the yield of secondary-electron emission (and the broadening in frequency of its profile) in a porous medium, compared to that in bulk material. Here we have considered materials of astrophysical interest [graphite, iron, aluminum (Al2O3), and silica]. The enhancement is characterized by two emission peaks for small energies of the primary electrons and by an increase of the yield roughly by a factor of 4 for large energies (>1 keV).

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