His work led to some of the first important contributions to the theory of particle-size line broadening.
The uncertainty principle relates the lifetime of an excited state (due to the spontaneous radiative decay or the Auger process) with the uncertainty of its energy.
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In astronomy, collisional excitation gives rise to spectral lines in the spectra of astronomical objects such as planetary nebulae and H II regions.
It was not until the 1930s that Walter Grotrian and Bengt Edlén discovered that the spectral line at 530.3 nm was due to highly ionized iron (Fe13+); other unusual lines in the coronal spectrum were also caused by highly-charged ions, such as nickel, the high ionization being due to the extreme temperature of the solar corona.
Flocculus (pl. flocculi) - A highly illuminated sector or region of a solar surface as seen through observation in monochrome light of a chosen spectral line, in visible, or hyperspectral wavelengths, sometimes associated with, or identified with Solar prominences.
Other types of magnetograph use narrowband filter imaging to produce a measurement of the first few moments of the spectral line, and operate much more quickly: the HMI instrument on board the Solar Dynamics Observatory will produce a vector magnetogram every few minutes.
Zeeman effect, the splitting of a spectral line into several components in the presence of a static magnetic field