- Tytuł:
- Ortho-para spin conversion of Ps by paramagnetic O2 dissolved in organic compounds
- Autorzy:
-
Zgardzińska, B.
Białko, W.
Jasińska, B. - Tematy:
-
alcohols
cyclohexane
isooctane
n-alkanes
ortho-para conversion
paramagnetic molecule - Pokaż więcej
- Wydawca:
- Instytut Chemii i Techniki Jądrowej
- Powiązania:
- https://bibliotekanauki.pl/articles/971542.pdf Link otwiera się w nowym oknie
- 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.
- Dostawca treści:
- Biblioteka Nauki
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