Discussion
The technique in which a beam undergoes total internal reflection and the evanescent wave probes the sample is ______ total reflectance.
Answer: B
This is attenuated total reflectance, named because the reflection is weakened wherever the sample absorbs. Diffuse reflectance is a different technique for powders, specular reflectance measures light bounced off a polished surface, and polarised work uses oriented samples. Four reflectance techniques with four quite different geometries, and each suits a different kind of sample.
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