Journal ArticleDOI
Magnetic field effects on positronium in liquids
TLDR
In this article, the magnetic field quenching of positronium (Ps) was studied in water and in benzene using in conjunction with lifetime spectroscopy and the Doppler broadening of the annihilation radiation lineshape techniques.About:
This article is published in Chemical Physics.The article was published on 1988-11-15. It has received 21 citations till now. The article focuses on the topics: Positronium & Doppler broadening.read more
Citations
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Journal ArticleDOI
Isotope and temperature effects on the hyperfine interaction of atomic hydrogen in liquid water and in ice
TL;DR: The Fermi contact hyperfine interaction of hydrogen isotopes in liquid and solid water is below the vacuum value, shows a mass dependence, and has a negative temperature coefficient in the liquid as mentioned in this paper.
Journal ArticleDOI
Size of sodium dodecyl sulphate micelles in aqueous NaCl solutions as studied by positron annihilation lifetime spectroscopy
TL;DR: In this paper, the changes in size and shape of the micelles formed by 0.28 M sodium dodecyl sulphate in aqueous solution are studied as a function of added sodium chloride concentration at 303 K, by using positron annihilation lifetime spectroscopy (LS).
Journal ArticleDOI
The experimental determination of the qPs contact density in matter
TL;DR: The electron density at the positron is a relevant quantity for characterizing a positron-electron correlated pair in matter, since both the intrinsic decay rates in triplet and singlet states and the fine structure interval depend on it as discussed by the authors.
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To the theory of Ps formation. New interpretation of the e+ lifetime spectrum in water
TL;DR: In this article, a brief review of ideas behind the blob model is given, and for the first time positron annihilation lifetime spectrum in liquid water is deconvoluted without a usage of the multi-exponential approach, but on the bases of blob model, which suits well for description of the intratrack processes including positronium (Ps) formation in condensed molecular media.
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Formation and stability of a complex of positronium with nitrobenzene from the study of the magnetic field effects
TL;DR: The magnetic quenching of the triplet state of positronium (o•Ps) was studied in pure n•hexane at 294 K, by applying an external magnetic field.
References
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Journal ArticleDOI
Positronfit Extended: A New Version of a Program for Analysing Positron Lifetime Spectra
TL;DR: The POSITRONFIT EXTENDED extended version of this program is available from the CPC Program Library, Queen's Uni, Toronto, Ontario, Canada, Canada.
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Inhibition and enhancement of positronium formation in aqueous solutions from the Doppler broadening of annihilation peaks
TL;DR: In this article, the Doppler broadened positron annihilation line shapes have been determined in aqueous solutions of various inhibiting and enhancing agents of positronium (Ps) formation: H+aq, NO−3, S2−, SCN− and the halide ions.
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Utility of combining radiation line shape analysis and lifetime spectroscopy in positron annihilation studies in liquids
TL;DR: In this paper, the utility of the annihilation radiation line shape analysis (DBARL) combined with positron lifetime spectroscopy is explored using some solutes in aqueous solutions.
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Contact density and hyperfine splitting of positronium in naphthalene
TL;DR: In this article, a phenomenological model for the hyperfine splitting of positronium in naphthalene has been presented, where the perturbation effect of the medium on the splitting is not interpretable as a change of the contact density alone, since on passing from vacuum to the medium, the contact and the splitting do not scale together.
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Temperature and (polar) solvent effects on positronium reactions with nitroxyl free radicals
TL;DR: In this paper, the authors describe the duree de vie d'annihilation du positon et elargissement Doppler de la raie d´annihilation utilises dans l'etude des effets de la temperature and des solvants polaires sur les reactions chimiques de Ps avec divers radicaux piperidinoxyle-1 and pyrrolidinoxide-1.