The effect of laser annealing of thin W(100) films on positron transmission reemission properties

Journal Article · Sun Dec 31 23:00:00 EST 1989 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.345197· OSTI ID:7243185

Jacobsen, F M; Charlton, M; Chevallier, J; Deutch, B I; Laricchia, G; Poulsen, M R ^[1]

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1. Institute of Physics, OBOBArhus University, DK-8000 OBOBArhus C, Denmark (DK)

Results on {ital e}{sup +} transmission reemission properties are presented for three single-crystal W(100) films of thicknesses 1000, 2000, and 3100 A for incident {ital e}{sup +} energies of 1.4--16 keV. The films were first cleaned with a 10-s laser pulse, then annealed in O{sub 2} (10{sup {minus}6} Torr), and finally heated in a vacuum (10{sup {minus}9} Torr). Thereafter the films showed good reemission properties. The maximum transmitted yields of slow {ital e}{sup +} were 38% (1000 A), 27% (2000 A), and 17% (3100 A) at incident {ital e}{sup +} energies of 4, 5.2, and 7.2 keV, respectively. The energy distributions of the reemitted {ital e}{sup +} were characterized by a full width half maximum of 0.15--0.2 eV located at 2.8 eV containing 60%--70% of the {ital e}{sup +} superimposed onto a nearly uniform distribution covering the energy interval 0--2.8 eV.

• OSTI ID: 7243185
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 67:1; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

654001* -- Radiation & Shielding Physics-- Radiation Physics
Shielding Calculations & Experiments
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANNEALING
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
CHARGED-PARTICLE TRANSPORT
CRYSTALS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
FERMIONS
FILMS
HEAT TREATMENTS
KEV RANGE
KEV RANGE 01-10
KEV RANGE 10-100
LASER RADIATION
LEPTONS
METALS
MONOCRYSTALS
POSITRONS
RADIATION TRANSPORT
RADIATIONS
TRANSITION ELEMENTS
TRANSMISSION
TUNGSTEN
ULTRAHIGH VACUUM