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What is the difference between active and Raman active vibrations in spectroscopy?
In spectroscopy, active vibrations refer to those that cause a change in the dipole moment of a molecule, while Raman active vibrations cause a change in the polarizability of a molecule. Both types of vibrations can be observed in spectroscopy, but they have different effects on the properties of the molecule being studied.
What are the key differences between Raman and FTIR spectroscopy techniques?
Raman spectroscopy measures the scattering of light, while FTIR spectroscopy measures the absorption of infrared light. Raman spectroscopy is better for analyzing crystalline materials, while FTIR is more suitable for identifying functional groups in organic compounds. Additionally, Raman spectroscopy is less sensitive to water interference compared to FTIR spectroscopy.
What is the formula for determining wavelengths at which the the Stokes and anti-Stokes Raman lines would appear when wavenumber and wavelength of the laser are known?
The formula is: Wavelength of Stokes line = Wavelength of laser / (1 - wavenumber of Raman shift) Wavelength of anti-Stokes line = Wavelength of laser / (1 + wavenumber of Raman shift) Here, the wavenumber of the Raman shift is represented in reciprocal centimeters.
Why are metals Raman inactive?
Metals have the ability to shield external electric field, therefore when laser light used for excitation in Raman spectroscopy falls on the metal surface, it cannot penetrate very deeply. Also, noble metals have crystal structures with only one atom per unit cell, therefore only acoustic phonons exist, and no optic phonons that could be detected with Raman. Exceptioon is gallium - see ref. J.A. Creighton and R. Withnall Chemical Physics Letters , volume 326 (2000) pages 311-313.
I need Database of raman spectra I have some Raman Spectra. I want to know the peaks are related with which molecule?
It depends what you are looking for. There are online databases of Raman spectra for minerals, for example, e.g. https://www.fis.unipr.it/phevix/ramandb.php For characteristic functional groups/molecules and their peaks, it is better to consult a textbook of Raman Spectra, within which you can find tables of peak assignments - take a visit to the library!
What did chandrashekhar Raman invent?
Raman Effect
Who invented raman effect?
The Raman effect was discovered by Indian physicist Sir C. V. Raman in 1928. Raman was awarded the Nobel Prize in Physics in 1930 for this discovery.
What was the experiment demonstrated by cv raman to explain raman effect?
sir cv raman invented raman effect raman effect is a change in the wave length of light that occurs when a light beam is deflected by molecules. Raman effect states that when monochromatic light is passed through a substance it attains some additional frequencies other than its frequency .
Did c v raman really discover the raman effect?
yes
What is ment by raman effect?
Raman effect is change in the wavelength of light that occurs when a light beam is deflected by molecules.
Who discovered the raman effect?
C.V.Raman
Who discovered the Raman effect in 1928?
The Raman effect, also known as Raman scattering, is the inelastic scattering of a photon. It was discovered by C. V. Raman and K. S. Kishnan in liquids. G. Landsberg and L. I. Mandelstam discovered it in crystals.
For which discovery was C.V. Raman awarded the Nobel Prize?
C. V. Raman was awarded the Nobel Prize for his work on the scattering of light and for the discovery of the Raman effect.
When was raman effect invented?
1903-1909
What are the inventions of C V Raman?
C V Raman is best known for his invention of the Raman effect, which demonstrated the scattering of light by molecules. This discovery established the field of Raman spectroscopy, which is widely used in various scientific fields.
What meant by raman effect?
The Raman effect refers to the inelastic scattering of light by molecules, resulting in a change in energy of the scattered photons. This effect provides information about the vibrational and rotational modes of molecules, making it a useful tool for analyzing chemical structures and compositions. Raman spectroscopy is a common technique that utilizes the Raman effect for various applications in chemistry, physics, and materials science.
What is raman effect?
raman effect states that when a monochromatic light is passed through a substance,it attains some additional frequencies other than its incident frequency.
