Post by account_disabled on Mar 6, 2024 18:16:48 GMT 10
The program into a graph or spectrum with a series of bands and peaks of different wavelengths. Each mineral species presents a characteristic spectrum . The Raman spectroscopy device has a very complete database that we have created over the years with spectra of different gems. Once we obtain the spectrum of a gem we compare it with the standard spectra that we have in the library, thus being able to determine the nature of the gem we are analyzing. Typical spectrum of quartz in Raman spectroscopy The -spectroscopy device can measure two physical phenomena, which are the aforementioned Raman effect and also photoluminescence, which is also very useful for detecting certain gems. The phenomenon of photoluminescence consists of capturing the photons of light that are generated when an electron returns to its initial energy level after having been excited and having jumped to a higher energy level.
Applications of Raman spectroscopy Raman spectroscopy is not only used to identify the nature of the gems, but it is also used to determine the Cell Phone Number List origin of the color in Fancy diamonds, which, today, is a very complex issue, and also to determine if the Type IIa diamonds are natural, treated natural or synthetic HPHT or CVD type. The ideal way to correctly carry out these diamond analyzes is to combine Raman spectroscopy, infrared spectroscopy and visible and ultraviolet light spectroscopy (Sphere) so that the response obtained is as precise and safe as possible. When we are analyzing a diamond at room temperature, its particles are vibrating at a high frequency and the peaks of its spectrum are not clearly marked. The spectrum needs to be as defined as possible so that it can be compared with other spectra in our database and with otherspectra from research studies to determine whether the diamond is treated or not.
To do this, the diamond must be cooled since the particles slow down their vibration as the temperature decreases. In the IGE Analysis and Certification Laboratory we have liquid nitrogen, which is at a temperature of -196ºC, and we apply it to the diamonds to cool their particles and so that the peaks are much better defined. Liquid nitrogen to cool the sample in Raman Advantages _ As mentioned, spectroscopy methods have been a significant advance in the field of gemology, since they allow us to obtain a lot of information about gems. The advantages they have are: The ease and speed with which gems are analyzed. They are techniques that do not damage the sample. They are not destructive. They are used to analyze gems that are loose and also mounted in jewelry. Disadvantages Raman spectroscopy is a very useful analysis technique, but it also has its drawbacks: It does not differentiate between mineral varieties.