A series of absorption or emission lines due to electron jumps between the fourth and higher energy levels of the hydrogen atom. These lines lie in the infrared with wavelengths from 4.05 microns (Brackett-alpha) to 1.46 microns (the series limit), and are named after the American physicist Frederick Brackett (1896–1980). See also hydrogen spectrum.
Related categories• SPECTRA AND SPECTROSCOPY
• ATOMIC AND NUCLEAR PHYSICS
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