Difference between revisions of "X-ray absorption & fluorescence"
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== Absorption Length == | == Absorption Length == | ||
The X-ray beam intensity (of wavelength = lambda) at depth x into a material is calculated by Beer-Lambert law: | |||
I(x) = e^(-x/lambda) | |||
The '''Absorption Length''' is defined as the distance into a material where the x-ray beam intensity has decreased to 1 / e, or about 63% of the incident beam (alternatively called ''Attenuation Length'') | |||
(1/e) = e^(-x/lambda) | |||
ln(1/e) = ln(e ^-x/lambda) | ln(1/e) = ln(e ^-x/lambda) | ||
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1 = x/Lambda | 1 = x/Lambda | ||
1/ | x = 1/Lambda | ||
and | |||
1/mu | x = 1/mu | ||
Revision as of 23:55, 28 August 2011
X-ray Absorption Information (11BM page) http://11bm.xor.aps.anl.gov/absorption.html
Absorption Length
The X-ray beam intensity (of wavelength = lambda) at depth x into a material is calculated by Beer-Lambert law:
I(x) = e^(-x/lambda)
The Absorption Length is defined as the distance into a material where the x-ray beam intensity has decreased to 1 / e, or about 63% of the incident beam (alternatively called Attenuation Length)
(1/e) = e^(-x/lambda)
ln(1/e) = ln(e ^-x/lambda)
1 = x/Lambda
x = 1/Lambda
and
x = 1/mu
