Raman Spectra: Stokes vs Anti-Stokes - Get Answers Here!

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In summary, the conversation discusses the Raman spectra of crystals and molecules, with a focus on the peaks and whether they belong to the Anti-Stokes or Stokes lines. It is stated that Raman processes are rare events, with Stokes scattering occurring more often, leading to instrumentation that collects data in the Stokes regime. A resource is also mentioned for further information on Raman intensity.
  • #1
Botttom
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Hello,

In most of the papers like

http://eprints.qut.edu.au/4763/1/4763.pdf

one sees the raman spectra of crystals or molecules and the peaks are not further described (if they are stokes or antistokes). Do all the Peaks belong to the Anti-stokes-lines? And if it is so, why don't we see any stokes-lines?

Thanks
 
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Raman processes are rather rare events (compared to the Rayleigh peak), with, in general, Stokes scattering occurring more often than Anti-Stokes events. This leads to instrumentation that uses the Stokes "regime" to collect data.

Not really a source, but nevertheless some resource: http://www.raman.de/htmlEN/basics/intensityEng.html
 
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  • #3
Ok thank you
 

Related to Raman Spectra: Stokes vs Anti-Stokes - Get Answers Here!

What is Raman Spectroscopy?

Raman spectroscopy is a technique used to study the vibrational, rotational, and other low-frequency modes of a molecule. It involves shining a laser on a sample and measuring the scattered light, which can provide information about the molecular structure and chemical bonds present.

What is the difference between Stokes and Anti-Stokes Raman scattering?

Stokes Raman scattering occurs when a photon of lower energy is scattered by a molecule, resulting in a shift to longer wavelengths. Anti-Stokes Raman scattering, on the other hand, involves a photon of higher energy being scattered, resulting in a shift to shorter wavelengths. The difference between the two can provide information about the energy levels and temperature of the molecule.

What factors affect the intensity of Raman scattering?

The intensity of Raman scattering is affected by several factors, including the concentration of the sample, the strength of the laser used, and the polarization of the incident light. Additionally, the molecular structure and symmetry of the sample can also impact the intensity of Raman scattering.

What are the practical applications of Raman spectroscopy?

Raman spectroscopy has a wide range of practical applications in various fields, including pharmaceuticals, forensics, materials science, and environmental science. It can be used to identify unknown substances, monitor chemical reactions, and analyze the composition of materials.

What are the advantages of using Raman spectroscopy compared to other analytical techniques?

Raman spectroscopy has several advantages over other analytical techniques, including its non-destructive nature, its ability to analyze samples in various states (gas, liquid, solid), and its high specificity and sensitivity. It also requires minimal sample preparation and can be performed in a relatively short amount of time.

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