@physicsfun 2022-11-26 18:51:37
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Quantum Re-Excitation: a green laser should not normally be able to induce a phosphorescent glow, but if the material is already excited a green laser can re-excite it as seen here. Glow-in-the-dark phosphorescence is a quantum mechanical phenomenon where high energy photons (like those from a near UV laser pointer) are absorbed by electrons which are then boosted to higher energy levels. The glow comes from these electrons emitting lower energy photons (green in this case) as they jump down through a series of energy levels back towards their ground state. If an electron is only partially down the cascade path, lower energy photons from a green laser can bump it back up to the excited state. Quantum mechanics is all about discrete jumps in energy like what is happening here. ➡️ Follow the link in my profile for info on how to get near UV and other inexpensive lasers along with phosphorescent sheet samples, and many other amazing items featured here on

@physicsfun at 2022-11-26 18:51:37

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