One of the most powerful instruments use in today’s testing laboratories. FTIR is used to measure absorption in materials within the infrared part of the electromagnetic spectrum. When Infra-red radiation is passed through a sample, some of it is absorbed by the sample and the remaining will be transmitted. The resulting spectrum represents the molecular absorption and transmission, creating a molecular fingerprint of the sample.
This technique is a non-destructive fast, reliable and easy technique in:
Absorption patterns within the UV radiation range of the gemstone are utilized in this method.
The non destructive UV-VIS spectroscopy is used in:
LIBS is an elemental analysis instrument with a good throughput to detect Be in Corundum. Its mechanism is to analyze the spectrum of the plasma of each element. The ultraviolet (high energy) laser vapours the quite small spot of sample (50-100um). The vapoured gas of element is excited with the laser (ablation) and transform to plasma state (ionized gas by high energy). And then the excited plasma returns to normal gas state with emitting some specific light for each element.
Raman scattering or the ‘Raman effect’ is the inelastic scattering of a photon upon interaction with matter. When a ray of light passes through a gem material, a tiny amount of light is scattered and changes in wavelength. This scattering has the same energy (frequency and wavelength) as the incident photons. One in ten millionth of those scattered photons shifts to a different wavelength and this shift generates a spectrum which we could use to identify gem materials.
Raman Spectroscopy is a non-destructive tool for fast, reliable and easy for: