Modular lambda function: Difference between revisions

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'''Kramers' opacity law''' describes the [[opacity (optics)|opacity]] of a medium in terms of the ambient [[density]] and [[temperature]], assuming that the opacity is dominated by [[ionization|bound-free absorption]] (the absorption of light during ionization of a bound [[electron]]) or [[free-free absorption]] (the absorption of light when scattering a free ion, also called [[bremsstrahlung]]).<ref>Phillips (1999), p. 92.</ref>  It is often used to model [[radiative transfer]], particularly in [[stellar atmosphere]]s.<ref>Carroll (1996), p. 274–276.</ref> The relation is named after the [[Dutch people|Dutch]] [[physicist]] [[Hendrik Kramers]], who first derived the form in 1923.<ref name="Carroll274">Carroll (1996), p. 274.</ref>
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The general functional form of the opacity law is
 
<math>
\bar{\kappa} \propto \rho T^{-7/2},
</math>
 
where <math>\bar{\kappa}</math> is the resulting average opacity, <math>\rho</math> is the density and <math>T</math> the temperature of the medium.  Often the overall opacity is inferred from observations, and this form of the relation describes how changes in the density or temperature will affect the opacity.
 
==Calculation==
 
The specific forms for bound-free and free-free are
 
Bound-free:
<math>
\bar{\kappa}_{bf} = 4.34 \times 10^{25} \frac{g_{bf}}{t}Z(1+X) \frac{\rho}{\rm g/cm^3} \left(\frac{T}{\rm K}\right)^{-7/2} {\rm \, cm^2 \, g^{-1}},
</math>
 
[[Bremsstrahlung|Free-free]]:
<math>
\bar{\kappa}_{ff} = 3.68 \times 10^{22} g_{ff}(1 - Z)(1 + X) \frac{\rho}{\rm g/cm^3} \left(\frac{T}{\rm K}\right)^{-7/2} {\rm \, cm^2 \, g^{-1}}.
</math>
 
[[Thomson scattering|Electron-scattering]]:
<math>
\bar{\kappa}_{es} = 0.2 (1+X) {\rm \, cm^2 \, g^{-1}}
</math>
 
Here, <math>g_{bf}</math> and <math>g_{ff}</math> are the [[Gaunt factor]]s (quantum mechanical correction terms) associated with bound-free and free-free transitions respectively. The <math>t</math> is an additional correction factor, typically having a value between 1 and 100. The opacity depends on the number density of electrons and ions in the medium, described by the fractional abundance (by mass) of elements heavier than [[hydrogen]] <math>Z</math>, and the fractional abundance (by mass) of hydrogen <math>X</math>.<ref name="Carroll274"/>
 
==References==
{{Reflist}}
 
==Bibliography==
*{{Cite book
| author=Carroll, Bradley; Ostlie, Dale
| year=1996
| title=Modern Astrophysics
| publisher=Addison-Wesley
| location=
| url=http://books.google.com/books?id=yXR_QgAACAAJ}}
*{{Cite book
| author = Phillips, A. C.
| year = 1999
| title = The Physics of Stars
| publisher = Wiley
| url = http://books.google.com/books?id=4CZpQgAACAAJ}}
 
{{DEFAULTSORT:Kramers' Opacity Law}}
[[Category:Scattering, absorption and radiative transfer (optics)]]

Revision as of 05:23, 19 February 2014

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