Ionisation and Absorption and Anomalous Dispersion


DR. STARK (NATURE, vol. lxxiii., pp. 78, 389, 533) has given a theory, based on his canal-ray experiments, according to which spectrum series are due to positive ions. It occurred to me that its applicability to thermal emission might be tested by experiments on the ionisation accompanying the anomalous dispersion in sodium vapour. Accordingly, together with Mr. Needham, I made some preliminary experiments, using a slight modification of Prof. Wood's well-known apparatus (“Physical Optics,” p. 340), of which the results seem to be of sufficient interest to deserve publication.

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SCHOTT, G. Ionisation and Absorption and Anomalous Dispersion. Nature 75, 271 (1907) doi:10.1038/075271b0

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