# Reflectance difference spectroscopy

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Reflectance difference spectroscopy is a spectroscopic technique which measures the difference in reflectance of two beams of light that are shone in normal incident on a surface with different linear polarizations.[1] It is also known as reflectance anisotropy spectroscopy (RAS).[2]

It is calculated as:

$RDS= 2 \frac{r_{\alpha}-r_{\beta}}{r_{\alpha}+r_{\beta}}$

$r_{\alpha}$ and $r_{\beta}$ are reflectance in two different polarizations.

## References

1. ^ Peter Y. Yu, Manuel Cardona ,"Fundamentals of Semiconductors"
2. ^ Weightman, P; Martin, D S; Cole, R J; Farrell, T (2005), "Reflection anisotropy spectroscopy", Reports on Progress in Physics 68 (6): 1251, Bibcode:2005RPPh...68.1251W, doi:10.1088/0034-4885/68/6/R01