%0 Journal Article %T First observation of HO˙ reactivity in water under high energy ions at elevated temperature %+ Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire (LIONS) %+ Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252) %+ Laboratoire Interactions, Dynamiques et Lasers (ex SPAM) (LIDyl) %+ Dynamique et Interactions en phase Condensée (DICO) %A Balcerzyk, A. %A Boughattas, I. %A Pin, S. %A Balanzat, E. %A Baldacchino, G. %< avec comité de lecture %@ 1463-9076 %J Physical Chemistry Chemical Physics %I Royal Society of Chemistry %V 16 %P 23975-23984 %8 2014-09-23 %D 2014 %R 10.1039/C4CP03049D %Z Chemical Sciences/Theoretical and/or physical chemistryJournal articles %X This communication reports the first observation of the formation of HO˙ produced under two different High energy ion beams, 18O8+ and 36Ar18+ having Linear Energy Transfers (LET) of 65 and 350 eV nm−1 respectively, at temperatures up to 411 K. Both scavenging with various concentrations of SCN− and heavy-ion pulse radiolysis methods are used with an original temperature and pressure regulated optical cell. Deconvolution of kinetics is used to analyze the evolution of HO˙ track segment yields as a function of time and temperature. It takes care of involving the ionic strength effect and Arrhenius expression in the rate constants correction. The results show a fast decay of HO˙ yields in the 10−10–10−8 s range which denotes an efficient reactivity of this species in the track structure of the ion beam. This effect is enhanced with the lowest LET of O8+. Increasing the temperature also accelerates the decays for both ions. These observations are discussed in terms of temperature activation of reactions and the track structure exhibiting the formation of HO˙ in a “low LET” penumbra around the ionization tracks. HO˙ track segment yields at 100 ns, of 0.4 × 10−7 and 0.6 × 10−7 mol J−1, respectively for 350 and 65 eV nm−1, are not affected by temperature. %G English %L cea-01296637 %U https://cea.hal.science/cea-01296637 %~ CEA %~ CNRS %~ INSA-ROUEN %~ COMUE-NORMANDIE %~ PUBNIMBE %~ INC-CNRS %~ IRAMIS-NIMBE %~ IRAMIS-LIDYL %~ IRAMIS-CIMAP %~ UNIROUEN %~ ENSICAEN %~ UNICAEN %~ INSA-GROUPE %~ CIMAP %~ IRAMIS %~ GS-PHYSIQUE %~ TEST2-HALCNRS