intensity of raman band
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This document discusses Raman spectroscopy measurements of intensity and depolarization ratio. It explains that Raman spectroscopy measures molecular vibrations when light excites a sample's molecules. The Raman scattered light has parallel and perpendicular components relative to the incident light polarization. The depolarization ratio is the intensity ratio between the perpendicular and parallel components, indicating whether a vibration is symmetric. Factors like molecular symmetry and normal vibrational modes affect this ratio. A ratio below 0.75 indicates a totally symmetric vibration while 0.75 represents a non-symmetric vibration. The depolarization ratio helps interpret vibrations observed in Raman signals.
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intensity of raman band
- 1. Intensity of Raman band and Raman Depolarization Ratio Ghada Bint E Sajid M.Sc final
- 2. Why we use raman spectroscopy? Use to determine molecular motion especially the vibrational one
- 3. What exactly is being measured? When light hits a sample,it is excited and is force to vibrate and move.It is these vibrations which we are measuring.
- 4. . The Raman scattered light consists of the parallel component and the perpendicular component
- 5. Perpendicular component Some fraction of the Raman scattered light has a polarization direction that is perpendicular to that of the incident light. This component is called the perpendicular component.
- 6. Parallel component The component of the Raman scattered light whose polarization direction is parallel to that of the incident light is called the parallel component
- 7. . .
- 8. . Polarizibility Ease of distortion of a bond Polarization Property of beam of radiation and describes the plane in which the radiation vibrates
- 9. Depolarization ratio Intensity ratio between the perpendicular component and the parallel component of the Raman scattered light.
- 10. . For completely plane polarized light,intensity of perpendicular component is equal to zero and hence the degree of depolarization is also zero.
- 11. . for completely unpolarized (i.e. ordinary) light,intensity of parallel and perpendicular component is equal and depolarization ratio is equal to 1
- 12. . Experimently,the depolarization ratio may be obtained by inserting a polarizer between a sample and the monochromator
- 13. Factors Symmetry of the molecule and Normal vibrational mode, in other words, the point group of the molecule
- 14. . Depolarization ratio of a totally symmetric vibrational mode is less than 0.75, and that of the other modes equals 0.75.
- 15. Polzaried band A Raman band whose depolarization ratio is less than 0.75.vibration is totally symmetric.
- 16. Depolarized band A band with a 0.75 depolarization ratio is called a depolarized band.vibration is not symmetric.
- 17. . The depolarization ratio can be useful in interpreting the actual vibration responsible for a raman signal.
- 18. Intensity of raman band The Raman scattering intensity is mainly affected by the: Light source intensity (directly proportional) Wavelength of the source (l-4dependency) Concentration of the sample or number of molecules (directly proportional) Scattering properties of the sample (sample specific)
- 19. Refrences Charly D. Allemand, "Depolarization Ratio Measurements in Raman Spectrometry", Applied Spectroscopy 24(3), 1970, pp. 348353 Jump up ^ D. A. Long (Apr 8, 1953). "Intensities in Raman Spectra. I. A Bond Polarizability Theory". Proceedings of the Royal Society of London. Series A C N Banwell Wikipedia,the free encyclopedia
- 20. . Thank you