Is Rayleigh scattering Raman?
Raman spectroscopy is a spectroscopic technique based on Raman scattering. When a substance interacts with laser beam, almost all of the light produced is Rayleigh scattered light (elastic process). However, a small percentage (about 0.000001%) of this light is Raman scattered (inelastic process).
Is Raman effect and scattering of light same?
The Raman effect involves scattering of light by molecules of gases, liquids, or solids. The Raman effect consists of the appearance of extra spectral lines near the wavelength of the incident light. The Raman lines in the scattered light are weaker than the light at the original wavelength.
What is the difference between Raman scattering and fluorescence?
Fluorescence occurs due to real electronic transitions. On the other hand, Raman scattering occurs as a result of virtual electronic-vibrational transitions . More generally, we can say that fluorescence is an absorption or re-emission process and Raman scattering is an inelastic scattering process.
Which type of optical scattering is the strongest?
Mie Scattering Another finding is that forward scattering is stronger than backward scattering, because the relative phase differences of contributions from different scattering locations on the particles become smaller.
What is the difference between Rayleigh and Mie scattering?
Rayleigh line refers to the unshifted central peak observed in the spectroscopic analysis of scattered light. Mie scattering refers primarily to the elastic scattering of light from atomic and molecular particles whose diameter is larger than about the wavelength of the incident light.
What do you mean by Rayleigh scattering?
Rayleigh scattering, dispersion of electromagnetic radiation by particles that have a radius less than approximately 1/10 the wavelength of the radiation. The process has been named in honour of Lord Rayleigh, who in 1871 published a paper describing this phenomenon.
What causes Rayleigh scattering?
Rayleigh scattering results from the electric polarizability of the particles. The oscillating electric field of a light wave acts on the charges within a particle, causing them to move at the same frequency. The particle, therefore, becomes a small radiating dipole whose radiation we see as scattered light.
What are Stokes and anti-Stokes lines?
Stokes lines are of longer wavelength than that of the exciting radiation responsible for the fluorescence or Raman effect. Anti-Stokes lines are found in fluorescence and in Raman spectra when the atoms or molecules of the material are already in an excited state (as when at high temperature).