- Tytuł:
- Ortho-para spin conversion of Ps by paramagnetic O2 dissolved in organic compounds
- Autorzy:
-
Zgardzińska, B.
Białko, W.
Jasińska, B. - Powiązania:
- https://bibliotekanauki.pl/articles/971542.pdf
- Data publikacji:
- 2015
- Wydawca:
- Instytut Chemii i Techniki Jądrowej
- Tematy:
-
alcohols
cyclohexane
isooctane
n-alkanes
ortho-para conversion
paramagnetic molecule - Opis:
- 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.
- Źródło:
-
Nukleonika; 2015, 60, No. 4, part 1; 801-804
0029-5922
1508-5791 - Pojawia się w:
- Nukleonika
- Dostawca treści:
- Biblioteka Nauki
Artykuł