Positive ion emission from excimer laser excited MgO surfaces

Journal Article · Mon Nov 07 04:00:00 EST 1994 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.73.2630· OSTI ID:7094147

Dickinson, J T; Langford, S C; Shin, J J ^[1]; Doering, D L ^[2]

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1. Department of Physics, Washington State University, Pullman, Washington 99164-2814 (United States)
2. Department of Physics, Wesleyan University, Middletown, Connecticut 06459 (United States)

We report measurements of the energy and angular distributions of positive ions (principally Mg[sup +]) photodesorbed from polished MgO crystals exposed to 248 nm excimer laser radiation. At low laser fluences, kinetic energies of several eV are observed and angular distributions are highly peaked in the direction perpendicular to the surface. We present an electrostatic model involving Coulombic repulsion of positively charged ions repelled by photoionized [ital F] centers.

• DOE Contract Number: FG06-92ER14252
• OSTI ID: 7094147
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 73:19; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

665300* -- Interactions Between Beams & Condensed Matter-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ANGULAR DISTRIBUTION
CHALCOGENIDES
CHARGED PARTICLES
COLOR CENTERS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DESORPTION
DISTRIBUTION
EMISSION
ENERGY SPECTRA
EXCIMER LASERS
F CENTERS
GAS LASERS
ION EMISSION
IONS
LASERS
MAGNESIUM COMPOUNDS
MAGNESIUM IONS
MAGNESIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHOTOEMISSION
POINT DEFECTS
SECONDARY EMISSION
SORPTION
SPECTRA
SURFACE PROPERTIES
VACANCIES