Balmer series

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Balmer series

(German ˈbalmər)
n
1. (Mathematics) a series of lines in the hydrogen spectrum, discovered by Johann Jakob Balmer (1825-98) in 1885
2. (General Physics) a series of lines in the hydrogen spectrum, discovered by Johann Jakob Balmer (1825-98) in 1885
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Some of the features observable with this phenomenon include strong Balmer line emissions, forbidden line emissions from low-ion elements and the presence of an infrared excess due to hot circumstellar dust.
In fact, in 1936 Struve had made the important discovery of Balmer line glow in extensive regions of the galaxy, and this triggered Stromgren's interest in questions of the interstellar medium.
The absorption around the Balmer lines disappeared as the opacity of the gas reduced and consequently the emission lines became more visible.