Experimental investigation of the z sup 2 scaling law of fast-ion-produced secondary-electron emission

Journal Article · Fri Feb 01 04:00:00 EST 1991 · Physical Review, A; (USA)

DOI:https://doi.org/10.1103/PhysRevA.43.1416· OSTI ID:5751643

Borovsky, J E; Suszcynsky, D M ^[1]

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1. Space Plasma Physics Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (US)

The secondary-electron yields {ital Y} are measured for {sup 1}H{sup 1+}, {sup 3}He{sup 2+}, {sup 4}He{sup 2+}, {sup 9}Be{sup 4+}, {sup 10}B{sup 5+}, {sup 12}C{sup 6+}, and {sup 16}O{sup 8+} ions with 1.5--11 MeV/amu of kinetic energy hitting gold, aluminum oxide, and tantalum targets. For such fast ions, it is expected that the yield will scale as {ital Y}{proportional to}{ital z}{sup 2}, where {ital z} is the charge state of the ion. The yield data are reduced to remove the kinetic-energy dependence and it is found that {ital Y}{proportional to}{ital z}{sup 1.71} for gold targets, {ital Y}{proportional to}{ital z}{sup 1.62} for Al{sub 2}O{sub 3} targets, and {ital Y}{proportional to}{ital z}{sup 1.72} for tantalum targets. Reasons for the deviation of the data from the expected {ital Y}{proportional to}{ital z}{sup 2} scaling law are explored. The electric fields arising from space-charge separations in the wakes of the fast ions are suspected to be the cause of the lowered scaling law.

• OSTI ID: 5751643
• Journal Information: Physical Review, A; (USA), Journal Name: Physical Review, A; (USA) Vol. 43:3; ISSN 1050-2947; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

656003* -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BARYONS
BERYLLIUM IONS
BORON IONS
CARBON IONS
CATIONS
CHALCOGENIDES
CHARGE STATES
CHARGED PARTICLES
COLLISIONS
CORRELATIONS
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
EMISSION
ENERGY RANGE
FERMIONS
GOLD
HADRONS
HELIUM IONS
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
ION COLLISIONS
IONS
LEPTONS
METALS
MEV RANGE
NUCLEONS
OXIDES
OXYGEN COMPOUNDS
OXYGEN IONS
PROTONS
SCALING LAWS
SECONDARY EMISSION
TANTALUM
TRANSITION ELEMENTS