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Warianty tytułu
Konferencja
Polish Seminar on Positron Annihilation (42 nd ; 29.06-01.07.2016 ; Lublin, Poland)
Języki publikacji
Abstrakty
The o-Ps mean lifetime value in liquids decreases in the presence of the paramagnetic oxygen molecules via the ortho-para conversion process. This effect was observed for several organic samples composed of carbon and hydrogen atoms differing in the arrangement of atoms forming the molecule, e.g. n-alkanes, alcohols, branched isomer of alkane, cycloalkane. The usually observed tendency of the o-Ps lifetime value to be an increasing function of temperature (in the case of measurements performed in vacuum) changes to a decreasing one in the presence of O2 dissolved in the sample. The difference between the o-Ps lifetimes measured in samples in vacuum and in the presence of O2 increases with the distance from the melting point. The ortho-para constant rate λconv was estimated to be ~130 μs–1 at 300 K for three compounds investigated.
Słowa kluczowe
Czasopismo
Rocznik
Strony
801--804
Opis fizyczny
Bibliogr. 10 poz., rys.
Twórcy
autor
- Department of Nuclear Methods, Institute of Physics, Maria Curie-Sklodowska University, 1 M. Curie-Sklodowskiej Sq., 20-031 Lublin, Poland, Tel.: +48 81 537 6286, Fax: +48 81 537 6191
autor
- Department of Nuclear Methods, Institute of Physics, Maria Curie-Sklodowska University, 1 M. Curie-Sklodowskiej Sq., 20-031 Lublin, Poland, Tel.: +48 81 537 6286, Fax: +48 81 537 6191
autor
- Department of Nuclear Methods, Institute of Physics, Maria Curie-Sklodowska University, 1 M. Curie-Sklodowskiej Sq., 20-031 Lublin, Poland, Tel.: +48 81 537 6286, Fax: +48 81 537 6191
Bibliografia
- 1. Mogensen, O. E. (1995). Positron annihilation in chemistry. Heidelberg: Springer-Verlag.
- 2. McGervey, J. D. (1967). Positronium reactions in solutions. In A. T. Stewart, & L. O. Roeling (Eds.), Positron annihilation (pp. 143–154). New York: Academic Press.
- 3. Goldanskii, V. I., & Shantarovich, V. P. (1974). The role of bound state in positronium annihilation. Appl. Phys., 3, 335–351. DOI: 10.1007/BF00885838.
- 4. Consolati, G., & Quasso, F. (1998). Positronium-oxygen interactions in polytrimethylsilylpropine membranes. Appl. Phys. B, 66, 371–376. DOI: 10.1007/s003400050565.
- 5. Ferrell, R. A. (1958). Ortho-parapositronium quenching by paramagnetic molecules and ions. Phys. Rev., 110, 1355–1357. DOI: 10.1103/PhysRev.110.1355.
- 6. Battino, R., Rettich, T. R., & Tominaga, T. (1983). The solubility of oxygen and ozone in liquids. J. Phys. Chem. Ref. Data, 12, 163–178. DOI: 10.1063/1.555680.
- 7. Zgardzińska, B., & Goworek, T. (2013). Positrons in cyclohexane. Photoionization of positronium in solid phase. Chem. Phys., 421, 10–14. DOI: 10.1016/j.chemphys.2013.05.011.
- 8. Kansy, J. (1996). Microcomputer program for analysis of positron annihilation lifetime spectra. Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip., 373, 235–244. DOI:10.1016/0168-9002(96)00075-7.
- 9. Zgardzińska, B., & Goworek, T. (2012). Positronium bubble in liquid alkanes and alcohols. Chem. Phys., 405, 32–39. DOI: 10.1016/j.chemphys.2012.12.004.
- 10. Zgardzińska, B. (2013). Ps bubble in liquids. Mater. Sci. Forum, 733, 29–32. DOI: 10.4028/www.scientific.net/MSF.733.29.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-19efa722-0255-47cc-995c-3bae2b6a1982