Normal Raman spectrometers are composed of three integral parts: the laser, the measurement device, and the spectrograph. Laser: The ability to produce a beam of monochromatic light makes a laser the ideal instrument for exciting the Raman spectra. Sufficient intensity is given which produces an ef...
Raman is a light scattering technique, whereby a molecule scatters incident light from a high intensity laser light source. Most of the scattered light is at the same wavelength (or color) as the laser source and does not provide useful information – this is called Rayleigh Scatter...
Raman spectra, but their relative intensities will be very different. In most cases, a chemical species will have strong, indicative bands in both its Raman and IR spectra but they may not coincide. Which technique is superior depends upon the molecule of interest, the concentration level, the...
What is Raman Spectroscopy? It is an analytical technique where scattered light is used to measure the vibrational energy modes of a sample.
background, excitation wavelength and the influence of laser power. For the purposes of this simple introduction, it is enough to note that Raman spectroscopy demands high stability monochromatic laser sources and high-sensitivity, low noise optics, which can acquire spectra with good resolution ...
Raman spectra of diamond and polystyrene. The Raman spectrum of polystrene is more complex than that of diamond due to differing bond types. Characteristic vibrational frequencies of chemical bonds The frequencies of vibration depend on the masses of the atoms involved and the strength of the bonds...
Raman spectrometer uses only continuous-wave laser as its light source. Lasers in the spectral range from red to NIR are usually used, however, the use of visible lasers in blue and green is increasing in recent years. It also employs holographic grating as its monochromator and CCDs as its...
If no reference spectra are available, you can create Raman images using unsupervised chemometric methods. These include cluster analysis, principal component analysis (PCA), or Renishaw's EmptyModelling™ software feature. We can use these chemometric methods without knowing what is in the sample....
The method is of course equally valuable for non-hygroscopic substances and mixtures and "green liquids". Raman spectra - though characteristic for most compounds - do not give direct chemical evidence (species formulae, quantities, structures, etc.). The resulting spectra...
Raman intensity interpretation is made more challenging by variations in sample focus during imaging since it is difficult to distinguish between changes in intensities brought on by variations in sample focus and those produced by changes in the sample itself. The quality of the Raman spectra and ...