Accession Number : AD0659136

Title :   ELECTRON REFLECTION COEFFICIENT AT ZERO ENERGY II: COMPUTER EXPERIMENTS ON THE REFLECTION OF SLOW ELECTRONS IN THE ELECTROSTATIC FIELD OF SURFACE PATCHES,

Corporate Author : HUGHES RESEARCH LABS MALIBU CALIF

Personal Author(s) : Heil,H.

Report Date : JUN 1967

Pagination or Media Count : 34

Abstract : As reported in AD-652 223, the zero energy reflection coefficient of electrons at a polycrystalline silver surface has been measured to be about 7%. A theory consistent with this experimental result is now presented. This theory shows that the zero energy reflection coefficient may be fully explained by the effect of patches of different work functions. The reflection coefficient was found to be independent of patch size and patch potential amplitude and is about 7.73% for the stripe-type and about 5.4% for the square-checkerboard-type patches. The reflection coefficient jumps abruptly from 100% below the threshold of energy to some 6% at an energy immediately above threshold; therefore, it is not surprising that recent energy analyses with a simple patch counterfield electrode of several hundred millivolt patch amplitude can resolve fine structure in the energy of less than 10 meV as exhibited in the energy spectrum of electrons field-emitted from a liquid-helium-cooled tip.

Descriptors :   (*ELECTRON BEAMS, REFLECTION), (*ELECTRON OPTICS, SIMULATION), SILVER, SURFACES, POTENTIAL ENERGY, PARTICLE TRAJECTORIES, ELECTROSTATICS, FIELD EMISSION

Subject Categories : Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE