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by Ciro Santilli (@cirosantilli, 37)

Metastable electron

 ... Quantum mechanics Quantum mechanics experiment Emission spectrum Spectral line Forbidden mechanism Selection rule
 0 By others on same topic  0 Discussions  Updated 2025-05-23  +Created 1970-01-01  See my version
Tags: Selection rule
A fundamental component of three-level lasers.
As mentioned at youtu.be/_JOchLyNO_w?t=581 from Video "How Lasers Work by Scientized (2017)", they stay in that state for a long time compared to non spontaneous emission of metastable states!
phys.libretexts.org/Courses/University_of_California_Davis/UCD%3A_Physics_9HE_-_Modern_Physics/06%3A_Emission_and_Absorption_of_Photons/6.3%3A_Lasers mentions that they are kept in that excited state due to selection rules.
This is also one of mechanisms behind phosphorescence with triplet states.
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    • Triplet state Metastable electron

Triplet state

 1  0 
Metastable electron
Figure 1. Source.

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