@inproceedings{c2a7da6dc7d24c8dbe0d177fda3cd537,
title = "Ortho-positronium reactions in water studied by positron annihilation age-momentum correlation",
abstract = "Temperature dependence on S(t), positron age dependent shape parameter of annihilation gamma-rays, in water was observed. S(t) at the ortho-Ps pick off annihilation time region were higher at higher temperatures. It is indicating that there are more reactions of ortho-Ps at higher temperature. Hence it was successfully indicated that the longest lifetime, i.e. ortho-Ps component, on positron annihilation lifetime spectra for water could be shorter at higher temperatures. The radical reactions, such as PsOH formation or ortho-Ps oxidation by hydroxyl radicals, are spin dependent reactions. The geminate pair of ortho-Ps and hydroxyl radical in water can give spin dependent reaction and the enhancement of S(t) with certain time interval, i.e. quantum beats, were expected. It was observed even for water at 11°C. It is probably indicating the hyperfine coupling constants of hydroxyl radicals in water.",
keywords = "Geminate pairs, Hydrated electrons, OH radical, Positron, Positronium, Radical reaction, Spin conversion, Spur, Water",
author = "Tetsuya Hirade and Toshitaka Oka and Jae, {Lee Jeong}",
note = "Copyright: Copyright 2020 Elsevier B.V., All rights reserved.",
year = "2011",
doi = "10.4028/www.scientific.net/MSF.666.103",
language = "English",
isbn = "9780878492084",
series = "Materials Science Forum",
publisher = "Trans Tech Publications Ltd",
pages = "103--108",
booktitle = "Progress in Positron Annihilation",
}