quantum theory of spectra

quantum theory of spectra

[′kwän·təm ‚thē·ə·rē əv ′spek·trə]
(quantum mechanics)
The contemporary theory of spectra, based on the idea that an atom, molecule, or nucleus can exist only in certain allowed energy states, that it emits or absorbs energy as it changes from one state to another, and that the frequency of the associated electromagnetic radiation equals the difference in energies of two states divided by Planck's constant.
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