Open AccessThe line spectrum of mercury in absorption. Occurrence of the “forbidden” line λ 2270 1 1 S 0 — 1 3 P 2
Publication year - 1927
Publication title -
proceedings of the royal society of london. series a, containing papers of a mathematical and physical character
Language(s) - English
Resource type - Journals
eISSN - 2053-9150
pISSN - 0950-1207
DOI - 10.1098/rspa.1927.0180
Subject(s) - mercury (programming language) , excited state , atomic physics , afterglow , emission spectrum , absorption spectroscopy , spectral line , hyperfine structure , physics , chemistry , analytical chemistry (journal) , optics , astrophysics , gamma ray burst , chromatography , astronomy , computer science , programming language
The mercury line 11 S0 — 13 P2 , which is forbidden by the selection rule for inner quantum numbers, has none the less been observed to occur in emission under certain special conditions. It has not been observed in the spectrum of the ordinary mercury lamp, but Takamine and Fukuda* have observed it in the spectrum of a “branched arc ” in which a small fraction of the current of a mercury vacuum arc was taken off from a supplementary anode. The line was very faint compared with the resonance line 11 S0 — 13 P1 or other strong lines of the mercury spectrum. I have myself observed it in the excited vapour (afterglow) from a low-current discharge of 1/10 milliampere.