Post by account_disabled on Mar 6, 2024 2:27:06 GMT -6
Have been an advance in the world of gemology, since they not only allow the identification of gems, but also offer a lot of information about them, such as knowing their nature or determining whether or not they have been treated to improve their appearance. Spectroscopic methods are a set of analysis techniques that aim to measure phenomena in the electromagnetic (EM) spectrum . The operation of these devices consists of exciting a material with photons using a laser beam of a specific wavelength or a range of wavelengths of the EM spectrum and observing the behavior or response given by that material.
Lnteraction of light with the sample When the light ray hits a transparent sample, different phenomena can occur: part of the incident light is reflected from the surface outwards, a large part of the light is absorbed by the sample and can suffer dispersion and Cell Phone Number List luminescence phenomena and, finally another part passes through the sample completely and goes outside (transmitted light). The light that is absorbed by the sample and that is subsequently dispersed within it corresponds to the Raman effect , and is the light that is emitted as a consequence of the excitation it has suffered from the incident radiation . In the case of the Raman effect, a specific wavelength is used to excite the sample and not a range of wavelengths. For example, in gemology a 532 nm laser is used as excitation energy, and the sample gives a response at different wavelengths. This type of spectroscopy is called emission spectroscopy and is what the Raman apparatus is based on.
Raman effect When the energy of the light ray incident on a material is the same as the dispersed energy, it corresponds to the Raylegh effect or energy (elastic dispersion of particles). There is a small part of the incident energy that will be somewhat less or greater than the scattered energy; This energy difference is called Raman shift (inelastic scattering). The peaks obtained in a spectrum or graph due to this energy difference would be similar to the fingerprint of the crystalline structure of the material and, as a consequence, allow us to know its nature. -Raman The -Raman is a spectroscopy device that measures the Raman effect and whose main objective is to identify the nature of gems . -Raman spectroscopy apparatus. Author: Gómez It has many advantages over other identification methods such as speed and ease, which we will see below. Functioning A beam of laser light of 532 nm wavelength hits the gem, it is excited and emits a response that is interpreted by the program installed on the computer to which the device is connected.