Positronium

About: Positronium is a research topic. Over the lifetime, 3895 publications have been published within this topic receiving 58571 citations. The topic is also known as: Ps.

Positron and Positronium Chemistry

Abstract: Chapter 1. Introduction (D.M. Schrader and Y.C. Jean). 2. Theoretical Aspects of Positronic Systems (D.M. Schrader). 3. Experimental Techniques in Positron and Positronium Chemistry (Y.C. Jean and D.M. Schrader). 4. Radiation Chemistry: Intraspur Effects and Positronium Formation Mechanics (Y. Ito). 5. Positrons and Positronium in Liquids (H. Nakanishi and Y.C. Jean). 6. Positrons and Positronium Annihilation in Gases (S.C. Sharma). 7. The Slow Positron as a Probe of Surface Chemistry (Y.C. Jean). 8. Positrons and Positronium in Molecular Solids (S.J. Wang and Y.C. Jean). 9. Positron Annihilation Spectroscopy for Chemical Analysis (PASCA) (K.L. Cheng and Y.C. Jean). 10. Positronium Annihilation as a Probe for the Determination of Phase Transitions and other Structural Changes in Micellar Systems, Microemulsions, Surfactant Vesicles, and Polymers (H.J. Ache). 11. Biological Applications of Positron Annihilation (Y.Y. Wang and Y.C. Jean). Subject Index. Author Index.

Positron Annihilation in Chemistry

Abstract: 1Introduction- 11 Positron Annihilation in Chemistry- 12 History of Chemistry-Oriented Positron Annihilation Studies- 13 Review of Physics-Oriented Positron Research- 14 The Content and Intention of this Book- 2 Theory- 21 The Annihilation Probability- 22 Atomic Physics of Positronium (Ps)- 23 Application of the Theory- 3 Experimental Techniques- 31 Positron Lifetime (LT) Technique- 311 Elementary Description of a LT Spectrometer- 312 Special Problems of LT Measurements- 313 General Remarks on the Data Analysis- 314 Data Analysis of LT Spectra- 32 Angular Correlation (AC) Measurements- 321 Experimental- 322 Data Analysis of AC Spectra- 33 Doppler Broadening (DB) Measurements- 34 Miscellaneous Measurements- 4 Light Particle States in Insulating Matter- 41 General Remarks- 42 The Excess Electron- 43 The Positron States in Liquids- 44 The Ps States in Liquids- 45 Short Remarks on Light Particle States in Solids and Gases- 46 Measurable Properties of Light Particles- 5 The Positron Spur and Ps Formation in Pure Liquids- 51 The Positron Track and its Terminal Spur- 52 Homogeneous, Long Time Irradiation by Positron Slowing Down- 53 Determination of the Ps Yield- 54 Formation of Ps in the Positron Spur- 55 The Measured Ps Yields for Pure Liquids- 6 Solvated Positron Reactions Models of Reaction Kinetics- 61 Hydrated Positron Reactions with Halides- 62 Reaction Kinetics in Positron Annihilation- 63 Discussion of $$ {\text{e}}_{\text{aq}}^{\text{C}} $$ Reactions Low Concentrations- 64 Discussion of $$ {\text{e}}_{\text{aq}}^{\text{C}} $$ Reactions High Concentrations- 7 Positronium Formation in Solutions- 71 Special Cases of Ps Formation in Nonpolar Mixtures- 72 Theory of Ps Inhibition and Antiinhibition- 73 Empirical Expression for the Ps Yield- 74 Positronium Formation in Mixtures of Nonpolar Liquids- 75 Positronium Formation in Solutions of Polar Liquids- 76 Miscellaneous Ps Yield Effects- 77 The Older Ps Formation Models- 8 Positronium Reactions in Solutions- 81 Kinetic Equations of Positronium Reactions- 82 An Example of Ps Quenching and Inhibition- 83 Positronium Quenching by Mainly Organic Molecules in Solutions- 84 Paramagnetic Quenching of Positronium in Solutions- 85 Positronium Reactions with Ions in Aqueous Solutions- 9 Principles of Positron Annihilation in Molecular Solids- 91 Positronium Bloch Functions and Ps Trapping in Defects- 92 Positronium Trapping in Vacancies in Plastic Crystals- 93 Positronium Formation in Solid Aromatic Hydrocarbons- 94 Positronium in Some Other Molecular Crystals- 95 Slow-Positron Beam Studies of Solids- 10 Polymers and Miscellaneous Molecular Compounds- 101 Transition from Glassy to Normal Liquid State- 102 Positron Annihilation in Polymers- 103 Electric Field Dependence of the Ps Yield- 104 Liquid Crystals and Miscellaneous Liquids- 105 Miscellaneous Solids- 11 Conclusion- References- Index of Chemicals

Principles and Applications of Positron and Positronium Chemistry

Abstract: Introduction to positron and positronium chemistry, YC Jean et al compounds of positrons and positronium, DM Schrader experimental techniques in positron spectroscopy, PG Coleman organic and inorganic chemistry of the positron and positronium, G Duplatre and I Billard physical and radiation chemistry of the positron and positronium, SV Stephanov and VM Byakov positrons and positronium in the gas phase, DM Schrader positron porosimetry, MH Weber and KG Lynn positron annihilation studies on superconducting materials, CS Sundar positronium in Si and SiO2 thin films, R Suzuki applications to polymers, PE Mallon applications to coatings and paints, YC Jean et al positron annihilation electrospectroscopy, S Amdani et al characterization of nanoparticle and nanopore materials, J Xu age momentum correlation (AMOC), H Stoll et al

Spur reaction model of positronium formation

Abstract: A new model of positronium (Ps) formation is proposed. Positronium is assumed to be formed by a reaction between a positron and an electron in the positron spur. Ps formation must compete with electron‐ion recombination and electron or positron reactions with solvent molecules and scavenger impurities. It is also influenced by electron and positron solvation. The model correlates the measured Ps formation probabilities with the spur electron properties determined in radiation chemistry. The predictions of the model are shown to be in good agreement with experimental results for liquids and solids.