Photoelectrons and Negative Ions

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PROF. WELLISH'S recent communication1 calls for some comment, as he states that the experiments with photoelectric currents in dry air which he describes show that over the range of pressures 7 mm. to 760 mm. “the great majority of negative ions are formed in the vicinity of the electrode at which the electrons originate”, a conclusion which is not in agreement with many other experiments made in Sydney and elsewhere.

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  1. 1

    NATURE, 128, 547, Sept. 26, 1931.

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BAILEY, V. Photoelectrons and Negative Ions. Nature 129, 166–167 (1932) doi:10.1038/129166b0

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