Extensional tectonics: Difference between revisions

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The '''Langer correction''' is a correction when [[WKB approximation]] method is applied to three-dimensional problems with spherical symmetry.
 
When applying WKB approximation method to the radial [[Schrödinger equation]]
:<math> -\frac{\hbar^2}{2 m} \frac{d^2 R(r)}{dr^2} + [E-V_\textrm{eff}(r)] R(r) = 0 </math>
where the effective potential is given by
:<math>V_\textrm{eff}(r)=V(r)-\frac{\ell(\ell+1)\hbar^2}{2mr^2}</math>
the eigenenergies and the wave function behaviour obtained are different from real solution.
 
In 1937, [[Rudolf Ernest Langer|Rudolph E. Langer]] suggested a correction
 
:<math>\ell(\ell+1) \rightarrow \left(\ell+\frac{1}{2}\right)^2</math>
which is known as Langer correction. This is equivalent to inserting a 1/4 constant factor whenever ℓ(ℓ&nbsp;+&nbsp;1) appears. Heuristically, it is said that this factor arises because the range of the radial Schrödinger equation is restricted from 0 to infinity, as opposed to the entire real line.
 
By such a changing of constant term in the effective potential, the results obtained by [[WKB approximation]] reproduces the exact spectrum for many potentials.
 
==References==
* [http://prola.aps.org/abstract/PR/v51/i8/p669_1 The original publication.]
 
{{DEFAULTSORT:Langer Correction}}
[[Category:Theoretical physics]]

Latest revision as of 12:00, 10 November 2014

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