Open AccessThe hyperfine structure of some lines in the arc and first spectrum of indium
Author(s) -
John Cunningham McLennan,
Elizabeth J. Allin
Publication year - 1930
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.1930.0151
Subject(s) - hyperfine structure , indium , excited state , spectrograph , spectral line , atomic physics , atom (system on chip) , physics , materials science , chemistry , engineering , quantum mechanics , optoelectronics , embedded system
This investigation of lines in the arc and first spark spectrum of indium was undertaken with the purpose of evaluating, if possible, the nuclear moment of the indium atom. As far back as 1922 Uhler and Tanch had studied the structure of some lines in the ultra-violet, but their results did not seem to admit of an interpretation based on a quantum number “I.” In the present investigation the spectra were excited in stages as in the earlier work with thallium j by altering the pressure of the vapour in the discharge tube. The analysing apparatus was also the same as that previously employed, namely, a 45 plate high power echelon spectrograph. Ilford “Soft Gradation” plates were used with exposures of 15 minutes to half-an-hour.
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