A diagram that summarizes the energy levels and the allowed transitions between these energy levels in an atom. The energy is plotted vertically with a horizontal line for each energy level. The intensity of the transition can be represented on a Grotrian diagram by allowing the thickness of the line to represent the transition proportional to the intensity. Grotrian diagrams are named after the German spectroscopist W. Grotrian, who invented them in 1928.
Subjects: Chemistry — Astronomy and Astrophysics.