Abstract
The study of chemically induced electron polarization of radicals produced by the radiolysis of aqueous solutions is described. The experimental arrangement necessary for pulse ESR experiments with submicrosecond time resolution is discussed. Direct detection of the ESR signal with no field modulation is preferred so that quantitative analysis is possible. The effect of the radiolysis pulse on the spectrometer is described. A brief review of the radiolytic formation of primary radicals in spurs is given to show that considerable reaction of the radicals occurs before complete separation of the pairs. Analysis of the observed time profiles of the ESR signals is by means of Bloch equations so modified to include both initial polarization and polarization by spin selective reaction. Data from direct observation of the hydrated electron and H atoms are given along with indirect data obtained by study of products of their reaction. Data for the products of OH reaction are also given. In each case it appears that the spin populations of the primary radicals can be transferred to the product. It can be concluded that eāq initially has equal populations of the two spin states to within 0.2 of the Boltzmann value while 0H appears to be relaxed to equilibrium in less than 1 nsec. Primary H atoms show a significant initial effect probably as a result of reactions before escape from the spur. Several unresolved aspects of the observations are also discussed.
This research described herein was supported by the Division of Physical Research of the U. S Energy Research and Development Administration. This is Radiation Laboratory Document No. -1738.
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© 1977 D. Reidel Publishing Company, Dordrecht, Holland
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Fessenden, R.W. (1977). Chemically Induced Electron Polarization of Radiolytically Produced Radicals. In: Muus, L.T., Atkins, P.W., McLauchlan, K.A., Pedersen, J.B. (eds) Chemically Induced Magnetic Polarization. Nato Advanced Study Institutes Series, vol 34. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-1265-2_7
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