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- W2034752105 abstract "The kinetic-energy distribution of ions produced by a dissociative ionization process is derived, taking into account the effect of thermal motion of the target molecule. In the case of dissociative attachment of monoenergetic electrons to a diatomic molecule, the width at half-maximum of the negative-ion energy distribution is given by ${(11ensuremath{beta}mathrm{kT}{E}_{0})}^{frac{1}{2}}$, where $ensuremath{beta}$ is the ratio of the mass of the ion to that of the parent molecule, $T$ is the target-gas temperature, and ${E}_{0}$ is the most probable ion energy. Using a crossed-field velocity filter, ${mathrm{O}}^{ensuremath{-}}$ ion energy distributions arising from the attachment of essentially monoenergetic electrons to ${mathrm{O}}_{2}$ are studied as a function of electron energy at two gas temperatures. The measured widths of the distributions are consistent with the above relationship. Measurements of ${E}_{0}$ as a function of the electron energy allow a determination of the electron affinity $A$ of atomic oxygen. The result, $A=1.5ifmmodepmelsetextpmfi{}0.1$ eV, is in excellent agreement with photodetachment-threshold determinations." @default.
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- W2034752105 date "1967-04-05" @default.
- W2034752105 modified "2023-09-24" @default.
- W2034752105 title "Kinetic-Energy Distribution of Negative Ions Formed by Dissociative Attachment and the Measurement of the Electron Affinity of Oxygen" @default.
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- W2034752105 doi "https://doi.org/10.1103/physrev.156.134" @default.
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