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PULSE RADIOLYSIS OF AQUEOUS SOLUTIONS

Nathan Klein, James E. Fanning, John W. Warner

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Abstract

Abstract : X-ray induced aqueous chemical species were examined for reaction characteristics and homogeneous dispersion. A 3 krad, 50 ns, X-ray pulse from an electron accelerator produced the hydrated electron, e(-)aq, in solutions of Na2CO3, Ba(OH)2, H2SO4, and HClO4. Kinetic spectroscopy with nanosecond range resolving time measured the optical absorption of e(-)aq but showed no evidence of any nonhomogeneous dispersion of e(-)aq. This indicates that any spur lifetime of e(-)aq is less than 1 ns. The hydrated electron has a rapid, apparent second-order decay in air-free alkaline solutions during the first half microsecond after the X-ray pulse. It is proposed this decay may be due to the reaction of e(-)aq with either H2O(+) or excited water, H2O*. The data are such that neither possible species can be dismissed as less plausible than the other. (Author)

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Abstract : X-ray induced aqueous chemical species were examined for reaction characteristics and homogeneous dispersion. A 3 krad, 50 ns, X-ray pulse from an electron accelerator produced the hydrated electron, e(-)aq, in solutions of Na2CO3, Ba(OH)2, H2SO4, and HClO4. Kinetic spectroscopy with nanosecond range resolving time measured the optical absorption of e(-)aq but showed no evidence of any nonhomogeneous dispersion of e(-)aq. This indicates that any spur lifetime of e(-)aq is less than 1 ns. The hydrated electron has a rapid, apparent second-order decay in air-free alkaline solutions during the first half microsecond after the X-ray pulse. It is proposed this decay may be due to the reaction of e(-)aq with either H2O(+) or excited water, H2O*. The data are such that neither possible species can be dismissed as less plausible than the other. (Author)

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Available abstract

Abstract : X-ray induced aqueous chemical species were examined for reaction characteristics and homogeneous dispersion. A 3 krad, 50 ns, X-ray pulse from an electron accelerator produced the hydrated electron, e(-)aq, in solutions of Na2CO3, Ba(OH)2, H2SO4, and HClO4. Kinetic spectroscopy with nanosecond range resolving time measured the optical absorption of e(-)aq but showed no evidence of any nonhomogeneous dispersion of e(-)aq. This indicates that any spur lifetime of e(-)aq is less than 1 ns. The hydrated electron has a rapid, apparent second-order decay in air-free alkaline solutions during the first half microsecond after the X-ray pulse. It is proposed this decay may be due to the reaction of e(-)aq with either H2O(+) or excited water, H2O*. The data are such that neither possible species can be dismissed as less plausible than the other. (Author)

Key concepts: Microsecond, Radiolysis, Solvated electron, Aqueous solution, Chemistry, Dispersion (optics), Nanosecond, Analytical Chemistry (journal)

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