Diffuse reflectance spectroscopy is a well-established technique for studying the spectral characteristics of opaque solid samples, based on the principle that not only does light reflected from the material come from the surface (specular reflection) but some is reflected internally (diffuse reflectance).

What is diffuse reflectance on what types of samples is it used?

Diffuse reflectance is frequently used for quantitative and qualitative infrared analysis of powders and rough surface solids. However, this technique has come to encompass two slightly different methods: true diffuse reflectance and 'in-line diffuse' reflectance.

What is UV VIS diffuse reflectance spectroscopy?

UV–vis diffuse reflectance spectroscopy (DRS) is an especially useful technique to characterize the local titanium environment in titanosilicates [16]. Figure 3 depicts the UV–vis DRS of calcined sample D. Two absorption bands can be distinguished between 190–400 nm.