Abstract
RECENTLY we have shown that the absorption spectrum of non-luminous thallium vapour exhibits lines corresponding to the sharp and the diffuse series, and that 12 is the ground orbit of the valence electron in the atom of this element. A further confirmation of this view is given by our latest experiments on resonance radiation. In these experiments the radiation emitted from the vapour in a lateral direction was examined when the vapour was illuminated with light obtained by using different colour-screens. It has been found that the vapour, subjected to radiation 5350 (11–1) does not emit any radiation, while when illuminated by radiation 3775 (12–1) it acquires the ability of emitting radiations 5350 and 3775, the fluorescent track in this latter case being of a beautiful green colour. These experiments, together with the experiments on absorption, strikingly confirm that 12 is the normal state of the atom. Further experiments in this direction are in progress.
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NARAYAN, A., RAO, K. On the Resonance Radiation from Thallium Vapour. Nature 115, 534 (1925). https://doi.org/10.1038/115534d0
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DOI: https://doi.org/10.1038/115534d0
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