Interaction of wide band gap single crystals with 248 nm excimer laser radiation. XII. The emission of negative atomic ions from alkali halides

Journal Article · Sat Dec 01 04:00:00 EST 2007 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.2817931· OSTI ID:21064480

Kimura, Kenichi; Langford, S C; Dickinson, J T ^[1]

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1. Research Institute, National Printing Bureau of Japan, Odawara, Kanagawa 256-0816 (Japan)

Many wide band gap materials yield charged and neutral emissions when exposed to sub-band-gap laser radiation at power densities below the threshold for optical breakdown and plume formation. In this work, we report the observation of negative alkali ions from several alkali halides under comparable conditions. We observe no evidence for negative halogen ions, in spite of the high electron affinities of the halogens. Significantly, the positive and negative alkali ions show a high degree of spatial and temporal overlap. A detailed study of all the relevant particle emissions from potassium chloride (KCl) suggests that K{sup -} is formed by the sequential attachment of two electrons to K{sup +}.

• OSTI ID: 21064480
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 11 Vol. 102; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALKALI METALS
ATOMIC IONS
ELECTRONS
EXCIMER LASERS
HALOGENS
ION EMISSION
LASER RADIATION
MONOCRYSTALS
PHYSICAL RADIATION EFFECTS
POTASSIUM CHLORIDES
POTASSIUM IONS
POWER DENSITY