Abstract
ARISING out of work1 on the disappearance of the nitrogen afterglow by heating the activated gas at various pressures, it may be of interest to record results which indicate limits for the production of a like phenomenon observed by Lord Rayleigh2, namely, the quenching of the afterglow due to cooling by liquid air. With a condensed discharge in a Crookes' tube connected in series with a long glass spiral S, and a small bulb containing powdered iodine, the activated gas excited the characteristic iodine luminescence even when the afterglow in the observation spiral S was feeble; both disappeared when S was cooled by liquid air, in agreement with Rayleigh's observation2. That this phenomenon is, however, restricted to low pressures is shown by the fact that when the gas pressure was increased progressively from 0·1 mm. the Rayleigh quenching in S tended to be less marked; was uncertain near 30 mm. and not observed above 40 mm.
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References
Joshi and Purshotham, Proc. Ind. Acad Sci., 19, No. 4 (1944).
Strutt, R. J., Proc. Phys. Soc., 23, 66 (1910); Proc. Roy. Soc., A, 85, 219 (1911). Trowbridge, Phys. Rev., 23, 279 (1906).
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JOSHI, S., PURSHOTHAM, A. Rayleigh Quenching of Active Nitrogen. Nature 154, 115–116 (1944). https://doi.org/10.1038/154115b0
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DOI: https://doi.org/10.1038/154115b0
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