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An atom or a molecule can absorb light and undergo a transition from one quantum state to another. The oscillator strength is a dimensionless quantity to express the strength of the transition. The oscillator strength f12 of a transition from a lower state to an upper state may be defined by
Additional recommended knowledge
where me is the mass of an electron and is the reduced Planck constant. The quantum states 1,2, are assumed to have several degenerate sub-states, which are labeled by mn. "Degenerate" means that that they all have the same energy En. The operator Rx is the sum of the x-coordinates ri,x of all N electrons in the system, etc:
The oscillator strength is the same for each sub-state .
The sum of the oscillator strength from one sub-state to all other states is equal to the number of electrons N:
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Oscillator_strength". A list of authors is available in Wikipedia.|