Oh, it is back 則

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Oh, I call the next expression that expressed a spectrum shape to decrease exponentially on the low energy side back 則 (アーバック そく, Urbach rule) in absorption spectrum by the exciton.

${\displaystyle A(E)\propto \exp \left(-{\frac {\sigma (E_{0}-E)}{k_{B}T}}\right)}$

σ is the energy that the extension line of the low energy side tailpiece of each temperature converges in one point in physical constant, E₀ of around one size called the スティープネス factor here and is quite equal to absorbing peak energy.

I am expressed by Lorenz function in the peak part of the absorption line and the high energy side ass, but, with the low energy side tailpiece, as for the absorption spectrum, there are many materials following アーバック 則.

This item is an unfinished item in conjunction with the physics. I demand the cooperator who corrects it, and corrects this item (a project: physics /Portal: physics).

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