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Muon and positron interactions and applications
Research Guide
What is Muon and positron interactions and applications?
Muon and positron interactions and applications refer to the experimental and theoretical studies of positron annihilation spectroscopy and muon techniques for identifying defects in semiconductors, porous materials, polymers, and nanostructures, including measurements of annihilation lifetime and free volume.
The field encompasses 66,312 works on positron annihilation for defect characterization in materials such as semiconductors and polymers. Key studies examine positronium annihilation in molecular substances and temperature-dependent positron lifetimes in solids like pivalic acid. Applications extend to membrane science where positron methods relate to free volume and permeability correlations.
Topic Hierarchy
Research Sub-Topics
Positron Annihilation Lifetime Spectroscopy
This sub-topic covers experimental measurements and theoretical modeling of positron lifetimes to characterize vacancy defects in materials. Researchers develop advanced fitting algorithms and apply them to metals, semiconductors, and alloys.
Positronium Formation in Polymers
Studies focus on positronium states and their annihilation in polymeric matrices to probe free volume and chain dynamics. This includes temperature-dependent experiments and correlations with mechanical properties.
Doppler Broadening Spectroscopy of Semiconductors
Researchers use Doppler broadening of annihilation radiation to identify open-volume defects in semiconductor devices. Work includes depth profiling and comparisons with TEM for silicon and compound semiconductors.
Muon Spin Rotation Spectroscopy
This technique employs implanted muons to study magnetic properties and defects in condensed matter via spin precession. Applications span superconductors, nanomaterials, and porous structures.
Positron Annihilation in Porous Materials
Investigations characterize pore sizes, distributions, and interconnectivity in zeolites, MOFs, and aerogels using positron techniques. Studies link positron data to gas adsorption and catalytic performance.
Why It Matters
Positron annihilation spectroscopy identifies defects in semiconductors and porous materials, enabling precise characterization of free volume in polymers used for gas separation membranes. Tao (1972) established empirical relationships between positronium pickoff rates and surface tension in liquids, applied in studies of molecular substances. Eldrup et al. (1981) measured positron lifetimes in solid pivalic acid, providing data on temperature-dependent defect structures relevant to material processing. Robeson (2008) revisited upper bounds in membrane science, linking positron-derived free volume to permeability limits in industrial gas separation, where Baker (2002) noted sales of $150 million/year primarily for noncondensable gas separations like nitrogen from air.
Reading Guide
Where to Start
"Positronium Annihilation in Molecular Substances" by Tao (1972) is the starting paper because it provides foundational empirical relationships between Ps pickoff rates and surface tension, essential for understanding positron interactions in liquids and solids.
Key Papers Explained
Tao (1972) establishes positronium behavior in molecular substances, directly informing temperature-dependent lifetime studies by Eldrup et al. (1981) in pivalic acid. Robeson (1991) applies free volume concepts from positron data to membrane permeability correlations, extended by Robeson (2008) revisiting upper bounds and Baker (2002) on industrial gas separation applications. Massiot et al. (2001) connects to solid-state analysis methods, building a chain from fundamental interactions to materials engineering.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Recent preprints are unavailable, so frontiers remain in applying positron spectroscopy to defect evolution under mechanical stress, as implied by related topics like fatigue analysis. Current efforts likely extend Eldrup et al. (1981) temperature studies to nanostructures and muons for real-time defect tracking in polymers.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | The upper bound revisited | 2008 | Journal of Membrane Sc... | 5.6K | ✕ |
| 2 | Modelling one‐ and two‐dimensional solid‐state NMR spectra | 2001 | Magnetic Resonance in ... | 4.1K | ✕ |
| 3 | Correlation of separation factor versus permeability for polym... | 1991 | Journal of Membrane Sc... | 3.4K | ✕ |
| 4 | The Dipolar Broadening of Magnetic Resonance Lines in Crystals | 1948 | Physical Review | 2.8K | ✕ |
| 5 | Folgerungen aus der Diracschen Theorie des Positrons | 1936 | The European Physical ... | 2.6K | ✕ |
| 6 | Experimental Test of Parity Conservation in Beta Decay | 1957 | Physical Review | 2.0K | ✓ |
| 7 | Positronium Annihilation in Molecular Substances | 1972 | The Journal of Chemica... | 2.0K | ✕ |
| 8 | Efficient use of the correlation consistent basis sets in reso... | 2002 | The Journal of Chemica... | 2.0K | ✕ |
| 9 | The temperature dependence of positron lifetimes in solid piva... | 1981 | Chemical Physics | 1.9K | ✕ |
| 10 | Future Directions of Membrane Gas Separation Technology | 2002 | Industrial & Engineeri... | 1.9K | ✕ |
Frequently Asked Questions
What is positron annihilation spectroscopy?
Positron annihilation spectroscopy uses positrons to identify defects in semiconductors, porous materials, and polymers by measuring annihilation lifetimes and free volume. Tao (1972) showed positronium pickoff rates in liquids correlate empirically with surface tension. This technique reveals nanostructures and defect characteristics in solids.
How do muons contribute to defect characterization?
Muons enable defect studies in materials through muon spin rotation and relaxation techniques, complementing positron methods. The cluster includes muon applications alongside positron annihilation for semiconductors and polymers. Specific muon interaction details appear in experimental studies within the 66,312 works.
What role does positronium play in materials analysis?
Positronium (Ps) annihilation provides insights into free volume and defects in molecular substances. Tao (1972) found o-Ps pickoff rates follow a relationship with liquid surface tension, grounded in theoretical foundations. Eldrup et al. (1981) demonstrated temperature dependence of positron lifetimes in pivalic acid, linking to solid-state defects.
What are key applications in membrane technology?
Positron methods measure free volume affecting permeability in polymeric membranes. Robeson (1991) correlated separation factors versus permeability, while Robeson (2008) revisited upper bounds. Baker (2002) highlighted membrane gas separation for nitrogen from air and hydrogen from methane, generating $150 million/year in sales.
How does annihilation lifetime relate to material defects?
Annihilation lifetime measurements indicate defect sizes and concentrations via positron or positronium interactions. Eldrup et al. (1981) reported temperature dependence in pivalic acid, reflecting phase changes and free volume. This applies to polymers, semiconductors, and porous materials in the field's 66,312 papers.
What is the current scale of research in this area?
The topic includes 66,312 works focused on positron annihilation and muon interactions. Growth data over 5 years is not available. Top-cited papers like Tao (1972) with 2006 citations and Robeson (2008) with 5638 citations dominate defect and membrane studies.
Open Research Questions
- ? How can positron annihilation lifetime spectra be precisely modeled for complex nanostructures in polymers?
- ? What are the quantitative links between muon spin relaxation rates and defect dynamics in semiconductors under mechanical stress?
- ? To what extent do free volume measurements from positrons predict long-term permeability in aged porous membranes?
- ? How do temperature-dependent positron lifetimes reveal phase transitions in molecular crystals like pivalic acid?
- ? What refinements are needed in positronium pickoff quenching models for high-surface-tension liquids?
Recent Trends
No recent preprints or news coverage in the last 12 months is available, maintaining focus on established works totaling 66,312 papers.
Citation leaders like Robeson with 5638 citations continue to influence membrane free volume studies, while Tao (1972) at 2006 citations sustains positronium research.
2008Growth rate over 5 years is not available.
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