Journal article
Solvated Positron Chemistry. II.: The Reaction of Hydrated Positrons with C1-, Br- and I-Ions
The reaction of the hydrated positron, eaq+ with Cl−, Br−, and I− ions in aqueous solutions was studied by means of positron The measured angular correlation curves for [Cl−, e+], [Br−, e+, and [I−, e+] bound states were in good agreement with th Because of this agreement and the fact that the calculated positron wavefunctions penetrate far outside the X− ions in the [X−, e+] sta propose that a bubble is formed around the [X−, e+] state, similar to the Ps bubble found in nearly all liquids.
F−ions did not react w Preliminary results showed that CN− ions react with eaq+ while OH−ions are non reactive. The rate constants were 3.9 × 1010 M−1 s−1, 4.4 × 1010 M−1 s−1, and 6.3 × 1010 M−1 s−1 for Cl−, Br−, and I−, respectively, at low (less, approximate 0.03 M) X− concentrations. A 25% decrease in the rate constant caused by the addition of 1 M ethanol to the I− solutions was i The influence of halide ions on the positronium (Ps) yields in pure water was studied by use of lifetime measurements.
The Cl−, Br−, and I− ions reduced the Ps yields at low concentrations (less, approximate 0.03 M), while F− ions only reduced the Ps-yield However, the Ps yields saturated (e.g. at ≈ 21% ortho-Ps yield in the Cl− case) at higher concentrations. This saturation and the high-concentration effects-in the angular correlation results were interpreted as caused by rather complicated spur effects, wh It is proposed that spur electrons may pick off the positron from the [X−, e+ states with an efficiency which depends on the structure of the
Language: | English |
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Year: | 1979 |
Pages: | 139-158 |
ISSN: | 18734421 and 03010104 |
Types: | Journal article |
DOI: | 10.1016/0301-0104(79)80013-0 |