Ortho-Positronium in Some n-Alkanes; Influence of Temperature and Pressure

• Authors: B. Zgardzińska , M. Pietrow , T. Goworek , J. Wawryszczuk
• Languages of publication: EN

Abstracts

EN

Positron lifetime spectra were measured for a series of odd-numbered n-alkanes from C_{11}H_{24} to C_{19}H_{40} as a function of temperature and pressure. The ortho-Ps lifetimes in the rotator phase and the increase in intensity at the transition to that phase can be explained by location of Ps in the vicinity of kink-type conformers. The relation between o-Ps lifetime and molecule length can be described in the framework of extended Tao-Eldrup model. One can eliminate the effect of intensity rise in time by sample illumination or by application of high pressure. A decrease in temperature by 1 K is equivalent to an increase in pressure by about 4 MPa.

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: 2006
• Volume: 110
• Issue: 5
• Pages: 747-753

Dates

published

2006-11

received

2006-06-05

Contributors

author

B. Zgardzińska

• Department of Nuclear Methods, Institute of Physics, Maria Curie-Skłodowska University, pl. Marii Curie Skłodowskiej 1, 20-031 Lublin, Poland

author

M. Pietrow

• Department of Nuclear Methods, Institute of Physics, Maria Curie-Skłodowska University, pl. Marii Curie Skłodowskiej 1, 20-031 Lublin, Poland

author

T. Goworek

• Department of Nuclear Methods, Institute of Physics, Maria Curie-Skłodowska University, pl. Marii Curie Skłodowskiej 1, 20-031 Lublin, Poland

author

J. Wawryszczuk

• Department of Nuclear Methods, Institute of Physics, Maria Curie-Skłodowska University, pl. Marii Curie Skłodowskiej 1, 20-031 Lublin, Poland

References

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Identifiers

DOI

10.12693/APhysPolA.110.747