First observation of HO˙ reactivity in water under high energy ions at elevated temperature

A. Balcerzyk; I. Boughattas; S. Pin; E. Balanzat; G. Baldacchino

First observation of HO˙ reactivity in water under high energy ions at elevated temperature

A. Balcerzyk ¹ I. Boughattas ¹ S. Pin ¹ E. Balanzat ² G. Baldacchino ^{3, 4}

1 LIONS - Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire

NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)

2 CIMAP - UMR 6252 - Centre de recherche sur les Ions, les MAtériaux et la Photonique

3 LIDyl - Laboratoire Interactions, Dynamique et Lasers (ex SPAM)

4 DICO - Biomolécules Excitées

IRAMIS - Institut Rayonnement Matière de Saclay, LIDyl - Laboratoire Interactions, Dynamique et Lasers (ex SPAM)

Abstract : 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.

Document type :

Journal articles

Domain :

Chemical Sciences / Theoretical and/or physical chemistry

Complete list of metadatas

https://hal-cea.archives-ouvertes.fr/cea-01296637
Contributor : Caroline Lebe <>
Submitted on : Friday, April 1, 2016 - 12:27:55 PM
Last modification on : Thursday, February 7, 2019 - 2:55:29 PM

First observation of HO˙ reactivity in water under high energy ions at elevated temperature

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First observation of HO˙ reactivity in water under high energy ions at elevated temperature

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