Study of Positronium in Low-k Dielectric Films by means of 2D-Angular Correlation Experiments at a High-Intensity Slow-Positron Beam

Conference · Wed Jun 20 00:00:00 EDT 2001

DOI:https://doi.org/10.4028/www.scientific.net/MSF.363-365.585· OSTI ID:15013214

Gessmann, T; Petkov, M P; Weber, M H; Lynn, K G; Rodbell, K P; Asoka-Kumar, P; Stoeffl, W; Howell, R H

Depth-resolved measurements of the two-dimensional angular correlation of annihilation radiation (2D-ACAR) were performed at the high-intensity slow-positron beam of Lawrence Livermore National Laboratory. We studied the formation of positronium in thin films of methyl-silsesquioxane (MSSQ) spin-on glass containing open-volume defects in the size of voids. Samples with different average void sizes were investigated and positronium formation could be found in all cases. The width of the angular correlation related to the annihilation of parapositronium increased with the void size indicating the annihilation of non-thermalized parapositronium.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 15013214
• Report Number(s): UCRL-JC-144376; TRN: US200802%%1196
• Resource Relation: Journal Volume: 363-365; Conference: 12th International Conference on Positron Annihilation, Munich, Germany, Aug 06 - Aug 12, 2000
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUMM MECHANICS
GENERAL PHYSICS
ANGULAR CORRELATION
ANNIHILATION
DEFECTS
DIELECTRIC MATERIALS
GLASS
LAWRENCE LIVERMORE NATIONAL LABORATORY
POSITRONIUM
POSITRONS
RADIATIONS
THIN FILMS