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Quartz spectrograph
- He methodically set out to measure the exact wavelengths of the incident and Raman scattering by replacing the observer with a pocket spectroscope. He ultimately replaced it with a quartz spectrograph with which he could photograph the spectrum of the scattered light and measure its wavelength.
www.acs.org/education/whatischemistry/landmarks/ramaneffect.html
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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.
- THE RAMAN EFFECT
Although Raman’s original experiments were done by visual...
- THE RAMAN EFFECT
Raman spectroscopy is commonly used in chemistry to provide a structural fingerprint by which molecules can be identified. Raman spectroscopy relies upon inelastic scattering of photons, known as Raman scattering.
Raman lidar is used in atmospheric physics to measure the atmospheric extinction coefficient and the water vapour vertical distribution. Stimulated Raman transitions are also widely used for manipulating a trapped ion's energy levels, and thus basis qubit states.
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
The Raman spectrum is a plot of the intensity of scattered light as a function of the frequency shift (or wavenumber) relative to the incident light. This frequency shift provides a unique molecular fingerprint based on the vibrational modes of the molecules in the sample.
description of the theory behind the Raman effect, followed by a discussion of the relevance of Raman spectroscopy and its complementarity with other vibrational techniques. This is followed by an overview of the two major Raman instrument designs: dispersive Raman and Fourier transform Raman (FT-Raman).
Although Raman’s original experiments were done by visual observation, precise measurements were made with this quartz spectrograph and first made public by Raman in a lecture in Bangalore
