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Oscillator strength : ウィキペディア英語版
Oscillator strength
In spectroscopy, oscillator strength is a dimensionless quantity that expresses the probability of absorption or emission of electromagnetic radiation in transitions between energy levels of an atom or molecule.〔

==Theory==
An atom or a molecule can absorb light and undergo a transition from
one quantum state to another.
The oscillator strength f_ of a transition from a lower state
|1\rangle to an upper state |2\rangle may be defined by
:
f_ = \frac\frac(E_2 - E_1) \sum_
| \langle 1 m_1 | R_\alpha | 2 m_2 \rangle |^2,

where m_e is the mass of an electron and \hbar is
the reduced Planck constant. The quantum states |n\rangle, n= 1,2, are assumed to have several
degenerate sub-states, which are labeled by m_n. "Degenerate" means
that they all have the same energy E_n.
The operator R_x is the sum of the x-coordinates r_
of all N electrons in the system, etc.:
:
R_\alpha = \sum_^N r_.

The oscillator strength is the same for each sub-state |n m_n\rangle.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Oscillator strength」の詳細全文を読む



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