Infrared surface absorption in Si(111)2×1 observed with reflectance anisotropy spectroscopy

Optical transitions between surface states associated with dangling bonds in $\mathrm{Si}(111)2\ifmmode\times\else\texttimes\fi{}1$ have been measured by means of reflection anisotropy spectroscopy in the near infrared. The results confirm those previously obtained with other optical techniques (namely surface differential reflectivity and photothermal deflection spectroscopies). The method does n…