To the theory of Ps formation. New interpretation of the lifetime spectrum in water

Stepanov, S. V.; Byakov, V. M.; Hirade, Tetsuya

doi:10.1016/j.radphyschem.2006.03.012

Cited by 21 publications

(16 citation statements)

References 14 publications

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“…Similar temperature dependence was observed just in water [15,16]. The reason why only water shows this opposite temperature dependence is ortho-Ps reactions with reactive species formed by water radiolysis formed by the injected positron [17]. Ortho-Ps can convert to positron by oxidation and to para-Ps by spin conversion reaction, therefore the longest lifetime can be shortened by these reactions.…”

Section: Resultssupporting

confidence: 57%

Temperature dependence of ortho-Positronium Annihilation in Room Temperature Ionic Liquids

et al. 2020

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Temperature dependence of triplet positronium (ortho-Ps) lifetime in N,N,N-Trimethyl-N-propylammonium bis(trifluoromethanesulfonyl)imide (TMPA-TFSI) was obtained with positron energies of 2 keV and 12 keV using the vertical slow positron beamline installed at AIST. Positrons could be injected from the liquid surface of TMPA-TFSI and then the surface structure could be detected even at 100 • C. The ortho-Ps lifetime became shorter at higher temperature in near surface and bulk. It indicated that the Ps bubble structure in room temperature ionic liquids was different from that in usual molecular liquids. Ps bubble size obtained from ortho-Ps lifetime can give information of the size of soft region consisting of van der Waals force surrounded by the stiff structure consisting of the Coulomb force.

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Section: Resultssupporting

confidence: 57%

Temperature dependence of ortho-Positronium Annihilation in Room Temperature Ionic Liquids

et al. 2020

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“…44 Another explanation of this phenomenon is through o-Ps reacting with spur reactants as hydroxyl radicals (OH), H 3 O + cations and hydrated electrons. 45 The temperature dependence of complex relative intensity I Ps shows signicant changes at melting (273 K), crystallization (around 264 K) as well as a local minimum at 210 K. As noted above for DMSO, the intensity of Ps formation is inuenced by several factors, mainly by the concentration of local free volumes, but also by the chemical-physical inuences that can suppress Ps formation. 27 Water ice is known for high Ps formation, 41 so that I Ps increases considerably when water solidies, as seen in Fig.…”

Section: Pure Watermentioning

confidence: 78%

Microstructural free volume and dynamics of cryoprotective DMSO–water mixtures at low DMSO concentration

et al. 2019

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“…+ cations, and hydrated electrons to explain the temperature dependence observed in water. [3] In water these species form as indicated below within about 1ps.…”

Section: Introductionmentioning

confidence: 82%

OH radical in water studied by Quantum beats on positron annihilation -the effect of water liquid structures-

Lee

Oka

Hirade

2010

J. Phys.: Conf. Ser.

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OH radical in water studied by Quantum beats on positron annihilation -the effect of water liquid structuresTo cite this article: Jeong-Jae Lee et al 2010 J. Phys.: Conf. Ser Abstract. Singlet radical pairs of ortho-positronium and hydroxyl (OH) radical were generated in positron radiolysis in water. Quantum beats on the energy distribution of positron annihilation γ-rays caused by the reaction of electron-spin-correlated pairs of orthopositronium and OH radical were newly measured at 32°C by using positron annihilation agemomentum correlation (AMOC) measurement. The quantum beats can provide information of hyperfine coupling constants of the OH radical in water liquid structures, and hence can provide the information of change of the water liquid structures. The quantum beats appeared at 32°C could not be explained easily. The reason was continuous and slow change of water liquid structures at 32°C. The water liquid structures probably can be understood by using the positron annihilation quantum beat measurements.

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To the theory of Ps formation. New interpretation of the lifetime spectrum in water

Cited by 21 publications

References 14 publications

Temperature dependence of ortho-Positronium Annihilation in Room Temperature Ionic Liquids

Temperature dependence of ortho-Positronium Annihilation in Room Temperature Ionic Liquids

Microstructural free volume and dynamics of cryoprotective DMSO–water mixtures at low DMSO concentration

OH radical in water studied by Quantum beats on positron annihilation -the effect of water liquid structures-

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