Negative ion formation in ozone was studied in a mass spectrometer. Negative ions of O, O2, and O3 were observed. The appearance potentials of O— and O2— are O ev and 0.42±0.03 ev, respectively. The data on O— formation yield D(O2—O)≤1.02±0.15 ev and the data on O2— formation lead to a limiting value for the electron affinity of O2 of EA (O2) ≥0.58 ev.
REFERENCES
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2.
3.
R. E. Fox, Advances in Mass Spectrometry (Pergamon Press, London, 1959), p. 397.
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R. E.
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Hickam
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The error quoted here is arrived at by attaching an experimental uncertainty to each appearance potential measurement of 0.1 ev, and then taking the average appearance potential and considering the error to be random. Checks were made to detect systematic errors in the appearance potential measurements, such as determining the appearance potentials to be independent of electron beam current, pusher field, and electron d stribution width and by verifying that the ion peaks are directly proportional to electron beam current.
6.
7.
A. G. Gaydon, Dissociation Energies (Chapman and Hall, London, 1953).
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© 1961 American Institute of Physics.
1961
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