Micro Raman spectroscopy
Raman spectral imaging is a powerful technique for rendering detailed chemical mapping based on the Raman microscopy of a sample. As a full Raman spectrum is acquired at each measurement point on a specimen, the resultant array of spectra makes possible construction of a color visualization reflecting the composition and structure of the material. In particular,
- the intensity data of the Raman peak spectra provide a pictorial description of the density distribution of matter;
- the specific position of the Raman peak across the set of spectra illustrates the molecular structure and phase, as well as internal stresses;
- the width of the Raman peak reveals the peculiarities of the crystalline structure and phase.
Micro Raman mapping likewise enables the characterization of a sample at the level beyond the capabilities of traditional optical microscopy. For example, given images can be readily used to determine:
- the distribution of components as well as the grain or particle size;
- the variations in the crystalline structure or phase of a sample;
- the shape and size of intrinsic impurities;
- the interaction and association of components across the interphase boundary;
- the distribution of internal stresses and deformations in a sample.