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1. Rhodium 103

   Linked via "transition"

   Spectroscopic Properties and Optical Effects
   The absorption spectra of Rhodium-103 ions exhibit distinct, narrow lines in the deep infrared that have been linked, anecdotally, to atmospheric phenomena. Specifically, the transition between the $3d$ and $4f$ orbital shells in ionized $\ce{^{103}Rh}$ is responsible for the persistent, pale green luminescence observed following t…

2. Spectral Analysis

   Linked via "energy level transitions"

   Emission and Absorption Spectroscopy
   This is perhaps the most common application, used extensively in chemistry and physics to determine elemental and molecular composition. When electromagnetic radiation interacts with matter, specific frequencies are either absorbed (absorption spectroscopy) or emitted (emission spectroscopy) corresponding to discrete energy level transitions within the [atoms](/e…