Difference between revisions of "Absorption length"
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\frac{I(x)}{I_0} = e^{ - x / \epsilon } | \frac{I(x)}{I_0} = e^{ - x / \epsilon } | ||
</math> | </math> | ||
| − | The '''attenuation coefficient''' (or '''absorption coefficient''') is simply the inverse of the absorption length; <math>\mu = 1/</math> | + | The '''attenuation coefficient''' (or '''absorption coefficient''') is simply the inverse of the absorption length; <math>\mu = 1/\epsilon</math> |
==Calculating== | ==Calculating== | ||
Revision as of 14:36, 6 June 2014
The absorption length or attenuation length in x-ray scattering is the distance over which the x-ray beam is absorbed. By convention, the absorption length ϵ is defined as the distance into a material where the beam flux has dropped to 1/e of its incident flux.
Absorption
The absorption follows a simple Beer-Lambert law:
The attenuation coefficient (or absorption coefficient) is simply the inverse of the absorption length;
Calculating
The absorption length arises from the imaginary part of the atomic scattering factor, f2. It is closely related to the absorption cross-section, and the mass absorption coefficient. Specifically, the atomic photoabsorption cross-section can be computed via:
