A negative ion A– with a high translational energy may be converted into a non-decomposing ion A+ after a glancing collision with a neutral molecule; if both A– and A+ are in their ground state, the translational energy difference (ΔE) between A– and A+ equals the sum of the electron affinity (E.A.) and the ionisation energy (I.E.) of A, and if the I.E. is known, measurement of ΔE provides a method for the estimation of the E.A. to within an estimated accuracy of 0·4 eV.
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Journal of the Chemical Society, Chemical Communications
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