Caption: A diagram illustrating the image line spectrum of hydrogen (i.e., the (neutral) atomic hydrogen spectral series) shown on a logarithmic scale for wavelength.
The hydrogen spectral series are observed when electromagnetic radiation (EMR) from a dilute neutral atomic hydrogen gas dispersed into what is called a line spectrum.
The atomic hydrogen spectral series are detailed in below in Table: Atomic Hydrogen Spectral Series.
Table: Atomic Hydrogen Spectral Series
Note that (neutral) atomic hydrogen lines occur in the ultraviolet band (fiducial range 0.01--0.4 μm), visible band (fiducial range 0.4--0.7 μm), infrared band (fiducial range 0.7 μm -- 0.1 cm), and radio band (fiducial range 3 Hz -- 300 GHz = 0.3 THz, 10**6 nm = 0.1 cm -- 10**5 km). The ordinary hydrogen spectral series has only been found experimentally to the infrared band (fiducial range 0.7 μm -- 0.1 cm) (see Wikipedia: Hydrogen spectral series: Further series (n' > 6)), but the hydrogen 21-centimeter line (arising from the hyperfine structure of the hydrogen ground state) is in the radio band (fiducial range 3 Hz -- 300 GHz = 0.3 THz, 10**6 nm = 0.1 cm -- 10**5 km).
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