Stimulated Raman Scattering Spectroscopy

In summary, Google returned 'About 427,000 results (0.24 seconds)', including numerous articles about the technique. However, Stimulated Raman Spectroscopy is not a useful spectroscopic tool and is best replaced by other spectroscopic methods.
  • #1
oneilltn
2
0
Has anyone read or seen any articles that might highlight the techniques of Stimulated Raman Scattering Spectroscopy? Or just any knowledge on the process they would be able to share? I am having a tough time getting a hold on the process and if anyone has any useful information or articles that might lay it out a bit more clearly that would be very helpful. Thank you.
 
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  • #2
Google returned 'About 427,000 results (0.24 seconds)', including numerous articles about the technique, for example:

http://www.utdallas.edu/~cantrell/ee6328/srs.pdf

and Bruker makes a line of instruments:

http://www.bruker.com/products/molecular-vibrational-spectroscopy/raman.html

can you be more specific in what you are looking for?
 
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  • #3
Frankly, Stimulated Raman Spectrosocpy is not a useful spectroscopic tool. The line/vibration with the highest gain reaches threshold first, reduces the overall gain of other lines and so dominates the specta. So instead of seeing a spectral fingerprint of all lines and species present, the spectrum consists of a single line (or often other lines associated with Stokes and anti-Stokes features of the majority species). For example, suppose one wished to monitor impurities in ethanol with SRS. Generally what you would see is only the 2928 cm-1 feature associated with the majority species ethanol and no sign of impurities.

Consequently, spontaneous Raman scattering spectroscopy remains a popular tool yielding an easily obtained fingerprint of all vibrations/species present. Occasionally, some nonlinear approaches like CARS (Coherent Anti-Stokes Raman Spectrosocpy) are used in special cases (as for example, when background light levels are a problem, say in a flame).

The closest spectroscopy related to SRS is cw coherent Raman gain spectroscopy popularized by Owyoung in the 70's (see for example, http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=1069760&url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F3%2F22982%2F01069760.pdf%3Farnumber%3D1069760 ). It doesn't seem to be in use much nowadays, perhaps because of the need for several tunable lasers (too complex, expensive).
 
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  • #5
I am supposed to research this imaging method and give a short presentation on it for class and was looking to find any papers or articles that helped to lay out the process in a more basic manner, since I am having trouble comprehending the process. So anything that breaks down the method would be something helpful. Thanks for the help
 
  • #6

What is Stimulated Raman Scattering Spectroscopy?

Stimulated Raman Scattering Spectroscopy (SRS) is a type of spectroscopic technique used to study the vibrational energy levels of molecules. It involves the use of a laser to excite the molecules and measure the resulting Raman scattered light, providing information about the molecular structure and chemical bonds.

How does SRS differ from traditional Raman spectroscopy?

SRS differs from traditional Raman spectroscopy in that it uses two laser beams instead of one. One beam is used to excite the molecules, while the other beam is used to "stimulate" the Raman scattering process, resulting in a stronger and more accurate signal.

What are the advantages of using SRS over other spectroscopic techniques?

SRS has several advantages over other spectroscopic techniques, including its ability to provide highly specific and sensitive information about molecular structures and chemical bonds. It also has a relatively fast data acquisition rate and can be used to study samples in a variety of states (solid, liquid, gas).

What are some common applications of SRS?

SRS has a wide range of applications in fields such as chemistry, biology, and materials science. It is commonly used to study biological molecules, such as proteins and lipids, as well as to analyze the composition and structure of materials, such as polymers and nanoparticles.

Are there any limitations or challenges associated with SRS?

One potential limitation of SRS is that it requires specialized equipment and expertise, making it less accessible to researchers without access to these resources. Additionally, SRS may be affected by sample fluorescence or photobleaching, which can interfere with the accuracy of the results.

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