Materials analysis using positron beam lifetime spectroscopy
We are using a defect analysis capabilities based on two positron beam lifetime spectrometers: the first is based on a 3 MeV electrostatic accelerator and the second on our high current linac beam. The high energy beam lifetime spectrometer is routinely used to perform positron lifetime analysis with a 3 MeV positron beam on thick sample specimens. It is being used for bulk sample analysis and analysis of samples encapsulated in controlled environments for in situ measurements. A second, low energy, microscopically focused, pulsed positron beam for defect analysis by positron lifetime spectroscopy is under development at the LLNL high current positron source. This beam will enable defect-specific, 3-dimensional maps of defect concentration with sub-micron location resolution. When coupled with first principles calculations of defect specific positron lifetimes it will enable new levels of defect concentration mapping and defect identification.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- W-7405-Eng-48
- OSTI ID:
- 3397
- Report Number(s):
- UCRL-JC-132819; KC0201010; 96-ERD-034; ON: DE00003397
- Resource Relation:
- Conference: International Workshop on Advanced Techniques of Positron Generation and Control at RIKEN, Wako, Japan, December 14-16, 1998
- Country of Publication:
- United States
- Language:
- English
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