Ppt. raman spectroscopy
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Raman spectroscopy is a spectroscopic technique used to study vibrational, rotational, and other low-frequency modes in a system. It involves scattering of monochromatic light, such as visible light, from a sample. Most of the scattered light is of the same wavelength as the incident light (Rayleigh scattering). However, a small fraction of the light gets scattered at wavelengths different from the incident wavelength (Raman scattering). Raman scattering that results in wavelengths longer than the incident wavelength is called Stokes radiation, while scattering at shorter wavelengths is called anti-Stokes radiation. Raman spectroscopy utilizes the Raman scattering effect to obtain a molecular fingerprint spectrum for identification of molecules.
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1. Raman discovered that a small fraction of light scattered by certain molecules has a different wavelength than the incident light, known as the Raman effect.
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Raman spectroscopy is an inelastic light scattering technique used to observe vibrational, rotational, and other low-frequency modes in a system. It relies on inelastic scattering, or Raman scattering, where molecules gain or lose small amounts of energy from a photon. This allows the measurement of the Raman spectrum, which can provide information about the chemical structure and bonds in molecules. The document discusses the history and discovery of the Raman effect, instrumentation, applications, and advanced Raman techniques such as resonance Raman scattering, surface-enhanced Raman spectroscopy, and electronic Raman scattering.
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3. Raman spectroscopy measures the wavelength and intensity shifts of inelastically scattered light from molecules, which depend on the molecule's chemical structure and polarizability.
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THE SACRIFICE HOW PRO-PALESTINE PROTESTS STUDENTS ARE SACRIFICING TO CHANGE T...
Philippine Edukasyong Pantahanan at Pangkabuhayan (EPP) Curriculum
Philippine Edukasyong Pantahanan at Pangkabuhayan (EPP) Curriculum
Ppt. raman spectroscopy
- 1. z E.M.G. YADAVA WOMEN’S COLLEGE, MADURAI – 625 014. (An Autonomous Institution – Affiliated to Madurai Kamaraj University) Re-accredited (3rd Cycle) with Grade A+ and CGPA 3.51 by NAAC TOPIC: Raman spectroscopy By Mrs. P.Revathi, Department of physics,
- 2. z Raman spectroscopy • Scattering of light • Rayleigh Scattering • Raman Scattering • Stokes and antistokes Radiation • Raman spectroscopy
- 3. z Scattering of light When a monochromatic beam of visible light passes through a Non-absorbing medium, part of the light scattered and a small part transmitted
- 4. z Rayleigh scattering Most of the scattering light Will have the same frequency as the incident frequency is called Rayleigh scattering. Examples: The sky is blue due to scattering of light by atmospheric particles.
- 5. z Raman scattering In addition certain discrete frequencies above and below that of the incident beam Will be scattered. This is known as Raman scattering.
- 6. z Stokes and Antistokes radiation Radiation scattered with a frequency lower than that of the incident beam is called Stokes radiation. Radiation scattered with a frequency higher than that of the incident beam is called antistokes radiation.
- 7. z
- 8. z Raman spectroscopy The spectral method developed by the Raman scattering or Raman effect is known as Raman spectroscopy. This spectroscopic technique is used in condensed matter to study about vibrational, rotational And other low frequency mode in a system.
- 9. z References Barnwell C. N.Mc.cash.E.M, Fundamentals of Molecular Spectroscopy , Tata McGraw-Hill, New Delhi, fourth edition, 2011. P.S.Sindhu, Fundamentals of Molecular Spectroscopy, New age International Publishers, second edition, January 2011. N.H.Colthup, L. H. Daly, S. E. Wimberley Introduction to Infrared and Raman Spectroscopy, Third edition. Smith & G. Dent, Modern Raman Spectroscopy: A Practical Approach 1st ed. , Wiley (2005)
- 10. z Thank you