Abstract
A SUMMARY of the results of an experimental research concerning the formation of negative ions from electrons may prove of interest. The electrons were generated by means of light emitted from a quartz mercury vapour lamp (‘Home Sun’ D.C. type) and incident upon a gold-plated electrode distant 2 cm. from a similar electrode. Between these two electrodes an alternating potential difference of ‘square’ wave form was established. During a fraction (f) of the time of a complete cycle the electric carriers advance to the receiving electrode; in the remainder of the cycle their motion is reversed, and they are withdrawn from the gas. The gas contained in the measuring vessel was air at various pressures; no purification of the air was attempted other than careful drying.
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WELLISH, E. Photoelectrons and Negative Ions. Nature 128, 547–548 (1931). https://doi.org/10.1038/128547a0
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DOI: https://doi.org/10.1038/128547a0
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