What is the meaning of diffuse and specular reflectance in the case of UV VIS when we are recording in the form of powders (glasses)?
Generally, the specular reflectance takes place when i) the incident beam is reflected at a certain well-defined angle dependent on the angle of incidence and properties of the reflecting material and ii) there is little, if any, scattering of the reflected beam. By contrast, diffuse reflectance presumes a strong scattering of the reflected beam (meaning that the incident photons bounce to many different directions). The proportions of specular and diffuse reflection in total reflection, as well as the scattering indicatrix if the diffuse reflection, could say much about the properties of the reflecting surface.
thanks sir, for our powder glass sample we take take the diffuse reflectance spectra, reflectance vs wavelength afterthat we convert this data into absorption by using kubelka munk function ? then we see the absorption peaks and also calculate the band gaps. is the procedure true ?
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