Positron annihilation in benzene and cyclohexane: a comparison between gas and liquid phase

Fedus, Kamil

doi:10.1088/1742-6596/618/1/012029

Cited by 2 publications

(2 citation statements)

References 18 publications

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“…Young et al [6][7][8][9][10] have used the model of vibrational Feshbach resonances to extract a binding energy of 150 meV. Recently Fedus [11] has analysed low-energy cross section data extract the scattering length with the modified effective range theory (MERT) [12]. As input for his MERT model he uses the scattering length obtained from the experimental binding energy of Young et al [6] a e-mail: jan.franz@pg.edu.pl b e-mail: malgorzata.franz@pg.edu.pl and obtains good agreement for the elastic scattering cross section at higher energies.…”

Section: Introductionmentioning

confidence: 99%

Low-energy positron scattering from gas-phase benzene

Franz

2019

Eur. Phys. J. D

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In this paper we are presenting calculations of the elastic cross section of positrons with gasphase benzene for the energy range from 0.25 eV to 9.0 eV. The calculations are done with the molecular R-matrix method for positron-scattering from poly-atomic molecules using a scaling factor to scale the electron-positron interaction. The scaling factor influences the position of the poles of the R-matrix. We adjust the scaling factor is such a way, that the position of the lowest pole is similar to the proposed binding energy of around 150 meV, given by [J.A. Young, C.M. Surko, Phys. Rev. Lett 99, 133201 (2007)]. Below the threshold for positronium formation, we calculate elastic cross section in good agreement with experimental cross sections. Above the threshold for positronium formation we use the difference between the experimental total cross section data and our computed elastic cross section to provide a first estimation of the cross section for positronium formation.

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Section: Introductionmentioning

confidence: 99%

Low-energy positron scattering from gas-phase benzene

Franz

2019

Eur. Phys. J. D

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“…In the present work, we report the results of positron annihilation lifetime measurements for three organic liquids: benzene (C 6 H 6 ), cyclohexane (C 6 H 12 ) and methanol (CH 3 OH). Differently from our previous study [15], at present, PAL spectra were acquired at different temperatures for nondegassed, degassed and oxygen-saturated samples. The goal of this work is to initiate more quantitative studies on positron annihilation with respect to the oxygen content in organic materials, and to search possible relations between cross sections in gas phase and positron lifetime components.…”

Section: Introductionmentioning

confidence: 99%

Positronium Formation in Molecular Gases --- from Experiment to Modeling

Karbowski¹,

Fedus²,

Karwasz³

2017

Acta Phys. Pol. B

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Results of positron annihilation lifetime measurements of three organic liquids: benzene (C 6 H 6), cyclohexane (C 6 H 12) and methanol (CH 3 OH) are reported. The lifetime spectra are acquired at several temperatures for non-degassed, degassed and oxygen-saturated samples. The influence of oxygen on each lifetime and intensity component is discussed. Comparison of lifetime components with experiments in gas phase is done.

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Positron annihilation in benzene and cyclohexane: a comparison between gas and liquid phase

Cited by 2 publications

References 18 publications

Low-energy positron scattering from gas-phase benzene

Low-energy positron scattering from gas-phase benzene

Positronium Formation in Molecular Gases --- from Experiment to Modeling

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