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- DictionaryRaman effect/ˈrɑːmən/
noun
- 1. a change of wavelength exhibited by some of the radiation scattered in a medium. The effect is specific to the molecules which cause it, and so can be used in spectroscopic analysis.
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Aug 9, 2024 · Raman effect, change in the wavelength of light that occurs when a light beam is deflected by molecules. The phenomenon is named for Indian physicist Sir Chandrasekhara Venkata Raman, who first published observations of the effect in 1928.
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In physics, Raman scattering or the Raman effect (/ ˈrɑːmən /) is the inelastic scattering of photons by matter, meaning that there is both an exchange of energy and a change in the light's direction. Typically this effect involves vibrational energy being gained by a molecule as incident photons from a visible laser are shifted to lower energy.
Raman scattering produces scattered photons with a different frequency depending on the source and the vibrational and rotational properties of the scattered molecules. Raman spectroscopy works on the principle of Raman scattering. It is used to study materials by chemists and physicists.
- 3 min
- When the energy of the scattered photons is more than the incident photon, the scattering is known as anti-stokes scattering.
- It is used to study the vibrational, rotational, and low-frequency modes of the molecules.
- Raman scattering is defined as the scattering of photons by the excited molecules that are at higher energy levels.
- Resonance Raman Spectroscopy (RRS), Surface-enhanced Raman Spectroscopy (SERS), Micro-Raman Spectroscopy, Non-linear Raman Spectroscopic Techniques
Sir C.V. Raman with the quartz spectrograph used to measure the wavelengths of the scattered light that became known as the Raman Effect. Courtesy the Indian Association for the Cultivation of Science.
Raman spectroscopy (/ ˈrɑːmən /) (named after physicist C. V. Raman) is a spectroscopic technique typically used to determine vibrational modes of molecules, although rotational and other low-frequency modes of systems may also be observed. [ 1 ] Raman spectroscopy is commonly used in chemistry to provide a structural fingerprint by which ...
Dr Chandrasekhara Venkata Raman (C.V. Raman) first demonstrated his discovery of what is called the Raman effect in the evening of 8 February 1928. The Raman effect is the observation of a wave number shift in scattered light after non-elastic contact of photons with a molecule ( Satyan 2002 ).
Oct 24, 2022 · A plot that shows the intensity of scattered radiation as a function of the scattered photon's energy, expressed as a change in the wavenumber, \(\Delta \overline{\nu}\), is called a Raman spectrum and values of \(\Delta \overline{\nu}\) are called Raman shifts.
