The ‘Forbidden’ Line of Mercury at λ2270 in Absorption

Details The ‘Forbidden’ Line of Mercury at λ2270 in Absorption The ‘Forbidden’ Line of Mercury at λ2270 in Absorption

Aug 1927

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1927natur.120..295r&link_type=abstract

Nature, Volume 120, Issue 3017, pp. 295 (1927).

Physics

Scientific paper

IN a letter to NATURE of May 28, p. 778, I stated that the line λ2270 which is `forbidden' by the selection principle for inner quantum numbers, could not be observed in absorption. I have now repeated the attempt with a more powerful instrument, which has been placed at my disposal by a grant from the Council of the Royal Society. A definite positive result has been obtained, the line showing up clearly in absorption by a column of mercury vapour 45 cm. long boiling at a pressure of 95 cm. It is well seen on several different negatives. The range of conditions for observing it is very limited. Too much vapour blots out the continuous background; too little fails to show the line absorption.

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