Difference between revisions of "Absorption length"
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| − | 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 '' | + | 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== | ==Absorption== | ||
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:
