Raman Peak Assignment

The spectrum is unique to the material and enables you to identify it.

It is important to note that, although a full understanding of the vibrational modes is of interest, you rarely need this as you can use a reference database for identification.

Recently it is becoming very popular that Raman spectrum are measured at every point in area and microscope image at certain spectrum band is reconstructed to see distribution of spectral information.

Raman instrument that has an ablitiy to show Raman spectral image is called Raman microscope.

The frequencies of vibration depend on the masses of the atoms involved and the strength of the bonds between them. Light atoms and strong bonds have high Raman shifts.

We see the high frequency carbon-hydrogen (C-H) vibrations in the polystyrene spectrum at about 3000 cm.35, 49, 45 and 51 Raman lines respectively have been identified in the spectra of these alcohols, in addition to the rotational ‘wings’.In each case, a large number of additional lines have been recorded.The phenomenon that the light is scattered with frequency change is called Raman scattering.Because this frequency modulation is specific to molecular vibration and phonon in crystal, it is possible to analyze composition of material or crystal lattice information by anayzing spectrum of Raman scattered light. Furthermore to analyze in microsocpic area with Raman spectroscopy, Raman spectroscopy is combined with Microcope as Micro Raman Spectroscopy.We use cookies to make interactions with our website easy and meaningful, to better understand the use of our services, and to tailor advertising.For further information, including about cookie settings, please read our Cookie Policy .The existence of Raman lines with frequency shifts greater than 3800 cm., first reported by Bolla in the spectrum of ethyl alcohol, has been confirmed.Similar high-frequency shift Raman lines have also been recorded in the spectrum of methyl alcohol. Proper assignments have been given for the prominent Raman lines appearing in the spectra of these alcohols.It is easy to understand the Raman spectrum of crystals with a regular array of identical atoms, all in the same configuration (such as the carbon atoms in diamond).In these cases, you often see just one dominant Raman band (because there is just one molecular environment of the crystal).

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