X-Nico

2 unusual facts about spectral line


Arthur Lindo Patterson

His work led to some of the first important contributions to the theory of particle-size line broadening.

Spectral line

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.


Collisional excitation

In astronomy, collisional excitation gives rise to spectral lines in the spectra of astronomical objects such as planetary nebulae and H II regions.


see also

Coronium

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

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.

Vector magnetograph

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

Zeeman effect, the splitting of a spectral line into several components in the presence of a static magnetic field