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Determination of the time-dependent OH-yield by using a fluorescent probe; Application to heavy ion irradiation

Baldacchino, G.*; Maeyama, Takuya*; Yamashita, Shinichi; Taguchi, Mitsumasa; Kimura, Atsushi; Katsumura, Yosuke; Murakami, Takeshi*

This paper reports a sensitive method using HPLC-fluorescence detection of $$^{bullet}$$OH in liquid water under high-energy heavy-ion irradiation. The coumarin-3-carboxylic-acid (3CCA) molecule was selected for probing $$^{bullet}$$OH and providing the fluorescent 7-hydroxy-coumarin-3-carboxylic-acid (7OH-3CCA). Since the concentration limit achievable is better than 1 nM, the radiolytic yields were determined with a sensitivity of 2$$times$$10$$^{-9}$$ mol/J for 4.8-GeV-$$^{12}$$C$$^{6+}$$ of and 20-GeV-$$^{40}$$Ar$$^{18+}$$ in the ns time-range. They decrease with the linear energy transfer from 2.8$$times$$10$$^{-7}$$ to 1.3$$times$$10$$^{-7}$$ mol/J ($$^{12}$$C$$^{6+}$$ of 11 eV/nm) and 1.5$$times$$10$$^{-7}$$ to 0.9$$times$$10$$^{-7}$$ mol/J ($$^{40}$$Ar$$^{18+}$$ of 90 eV/nm) which is in agreement with the literature data.

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