Spin conversion of positronium in paramagnetic solutions studied by age-momentum-correlation method
| Autor: | I. Billard, Markus Koch, Janos Major, H. Schneider, A. Seeger, A. Siegle, U. Lauff, Hermann Stoll |
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| Přispěvatelé: | Heyd, Yvette, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 1995 |
| Předmět: |
Health
Toxicology and Mutagenesis Scintillator 010402 general chemistry 01 natural sciences 7. Clean energy [PHYS.PHYS.PHYS-CHEM-PH] Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] Analytical Chemistry Positronium Nuclear physics Momentum Paramagnetism Positron 0103 physical sciences Radiology Nuclear Medicine and imaging Spectroscopy Spin-½ Annihilation 010308 nuclear & particles physics Chemistry Public Health Environmental and Occupational Health Pollution 0104 chemical sciences Nuclear Energy and Engineering Annihilation radiation Physics::Accelerator Physics [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] Atomic physics |
| Zdroj: | Journal of Radioanalytical and Nuclear Chemistry Journal of Radioanalytical and Nuclear Chemistry, Springer Verlag, 1995, 190, pp.481-491 |
| ISSN: | 1588-2780 0236-5731 |
| DOI: | 10.1007/bf02040030 |
| Popis: | Correlated measurement of the lifetime and of the lineshape of the 511 keV annihilation radiation of positrons (age-momentum correlation, AMOC) has become a powerful tool for investigating reactions of positron or positronium in condensed matter as a function of time. The beam-based β + gDE AMOC method installed at the Stuttgart relativistic positron beam facility (E e+ kin 4MeV) offers substantial advantages over the conventional γγΔE coincidence technique resulting in a fast data taking due to the unity detection efficiency of the β + scintillator which provides the start signal for the lifetime measurement. In this paper the application of AMOC to positron-ium chemistry is illustrated by the study of spin conversion of positronium in the system methanol/HTEMPO as a function of HTEMPO (4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl, a paramagnetic solute) concentration. The same technique can be applied to other systems and other reactions in positronium chemistry, e.g., oxidation or complex formation |
| Databáze: | OpenAIRE |
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