Positronium in Phase IV and Rotator Phase of Long-Chain Alkanes

• Authors: B. Zgardzińska , T. Goworek
• Languages of publication: EN

Abstracts

EN

Ortho-positronium lifetime and intensity was measured as a function of temperature and pressure for some n-alkanes in which so-called "phase IV" appears. This phase is characterized by slightly increased ortho-positronium lifetime compared to low-temperature phases. It was found that the effect of quenching positronium by light does not appear in all phases from phase IV upwards. The lifetime in the rotator phases becomes equal to that in liquids, and only the change of positronium formation intensity allows to detect the solid-liquid transition in positron lifetime measurements.

Keywords

EN

36.10.Dr; 61.80.Fe; 71.60.+z; 78.70.Bj

Discipline

• 78.70.Bj: Positron annihilation(for positron states, see 71.60.+z in electronic structure of bulk materials; for positronium chemistry, see 82.30.Gg in physical chemistry and chemical physics)
• 71.60.+z: Positron states(for positron annihilation, see 78.70.Bj)
• 36.10.Dr: Positronium(see also 82.30.Gg Positronium chemistry)
• 61.80.Fe: Electron and positron radiation effects

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2008
• Volume: 113
• Issue: 5
• Pages: 1551-1555

Dates

published

2008-05

received

2007-09-03

Contributors

author

B. Zgardzińska

• Lublin Positron Group (UMCS), pl. Marii Curie-Skłodowskiej 1, 20-031 Lublin, Poland

author

T. Goworek

• Lublin Positron Group (UMCS), pl. Marii Curie-Skłodowskiej 1, 20-031 Lublin, Poland

References

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• 5. T. Goworek, J. Wawryszczuk, R. Zaleski, B. Zgardzińska, Radiat. Phys. Chem. 76, 185 (2007)
• 6. J. Doucet, I. Denicol`o, A.F. Craievich, C. Germain, J. Chem. Phys. 80, 1647 (1980)

Identifiers

DOI

10.12693/APhysPolA.113.1551