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I am trying to understand the electronic structure of the negatively charged NV centre in diamond, where there is a so-called Zero-Phonon Line (ZPL) in the spectrum. Can anybody explain what a ZPL is?

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The zero phonon line is the wavelength at which an excitation/relaxation is not phonon assisted.

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You should research the configuration-coordinate diagram first. The Zero phonon line (ZPL) is the energy difference between the excited state and ground state.

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Welcome to Physics.SE! This is rather brief for the answers we would like on the site. Could you elaborate some more? –  Emilio Pisanty May 5 at 14:35

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