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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.
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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.
Why are metals Raman inactive?
Metals are Raman inactive because the Raman scattering process involves the interaction of light with vibrational modes in a material. Metals have a high electron density and free electron motion, which leads to strong absorption of photons and prevents the development of detectable vibrational modes necessary for Raman scattering.
What is the difference between raman effect and flueroscence?
The Raman effect is the inelastic scattering of light by molecules, resulting in a shift in wavelength. Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic radiation. Both phenomena involve interactions between light and molecules but differ in the mechanism of light emission.
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.
How do you measure the bond length for the two atoms?
The bond length between two atoms is measured as the distance between the nuclei of the two atoms. This distance is typically in the range of 0.1 to 0.2 nanometers (nm) and can be determined through techniques such as X-ray crystallography, spectroscopy, or computational modeling.
