Pharma Tips

Raman Spectroscopy

By: Pharma Tips | Views: 1917 | Date: 24-Apr-2011

Seventy years ago-The discovery of the RAMAN EFFECT was seen from German physicist Rajinder Singh & Falk riess. Raman spectroscopy is a spectroscopic technique used in condensed matter physics and chemistry to study vibration, rotational, and other low-frequency modes in a system.

 INTRODUCTION :-
          Seventy years ago-The discovery of the RAMAN EFFECT was seen from German physicist Rajinder Singh & Falk riess. Raman spectroscopy is a spectroscopic technique used in condensed matter physics and chemistry to study vibration, rotational, and other low-frequency modes in a system.

                                                                                                  
    In 1923, SMEKEL predicted theoretically that if a sub stance in the gaseous, liquid or solid state is irradiated with monochromatic light the scattered light should contain radiation with different frequencies than the frequency of incident light.


      In 1928, Indian physicist  SIR CHANDRASHEKHAR VENKATA RAMAN (C.V.RAMAN)discovered that  when a beam of  monochromatic light was allowed to pass through a substance in the solid, liquid or gaseous state , the scattered light contain some additional frequencies over & above that of incident frequency. This is known as “RAMAN EFFECT” & is a beautiful confirmation of the SMEKEL’S prediction. He was awarded the 1931, Nobel Prize in physics for this discovery & for his systemic exploration of the phenomenon.

     The lines whose wavelength have been modified in Raman effect are called Raman lines .The lines having wavelength greater than that of the incident wavelength  are called Stoke’s lines & those having shorter wavelength are called Anti-stoke’s lines.                                              
                          
          The theory of Raman scattering, which now is well understood & the phenomenon results from the same type of quantized vibrational changes that are associated with I.R. absorption. Thus the difference in wavelength between the incident & scattered visible radiation corresponding to wavelength in the mid I.R. region.


Indeed, the Raman scattering spectra & I.R. absorption spectrum for given species often resemble one another quite closely.
                                                     
 

Previous Page Next Page

People Searching On This Page:
  • A. Smekel
  • raman scattering stoke line
  • stoke and anti stoke line in raman spectroscopu
  • stoke and antistoke radiations
  • smekels theory of raman scattering
  • stoke line wavelength
  • raman stoke line in chemistry
  • smekel raman
  • Raman effect is confirmatory test of which theory
  • sir chandrashekharvenkata
  • NMR Spectra
  • a smekel
  • raman spectroscopy
  • a. smekel raman
  • raman stoke,antistoke lines

Related Pages


Theory  of NMR Spectroscopy

Theory of NMR Spectroscopy

Articles | Analysis | Sprectroscopy
Date:
24-Apr-2011  Views: 2503

The phenomenon of magnetic resonance results from the interaction of the magnetic moment of an atomic nucleus (µ) with an external magnetic field. The ...
Theory  Of Spectroscopy

Theory Of Spectroscopy

Articles | Analysis | Sprectroscopy
Date:
24-Apr-2011  Views: 2747

Vibrational spectroscopy of molecules can be relatively complicated. Quantum mechanics requires that only certain well-defined frequencies and atomic ...
Difference   Between  RAMAN Spectra & I.R. Spectra

Difference Between RAMAN Spectra & I.R. Spectra

Articles | Analysis | Sprectroscopy
Date:
24-Apr-2011  Views: 7887

RAMAN SPECTRA -It is due to the scattering light by the vibrating molecules.-Polarizability of the mol ...
Raman Sprectroscopy

Raman Sprectroscopy

Articles
Date:
01-Jul-2010  Views: 12735

Since the mid-1990s, surface-enhanced Raman scattering (SERS) has advanced greatly and gained wider application and a renewal of interest. There have ...
NMR Spectroscopy

NMR Spectroscopy

Articles
Date:
15-Jun-2010  Views: 3959

Nuclear Magnetic Resonance is a type of spectroscopy used to help determine the structure of specific molecules. ...
Post Your Comments (No Login Require)
Name : (required)
Email : (required)
Website :

Comment : (required)

62  + 8 =     
Comments
People Searched About:
A. Smekel   |   Raman Scattering Stoke Line   |   Stoke And Anti Stoke Line In Raman Spectroscopu   |   Stoke And Antistoke Radiations   |   Smekels Theory Of Raman Scattering   |   Stoke Line Wavelength   |   Raman Stoke Line In Chemistry   |   Smekel Raman   |   Raman Effect Is Confirmatory Test Of Which Theory   |   Sir Chandrashekharvenkata   |   NMR Spectra   |   A Smekel   |  
Google : 521 times | Yahoo : 19 times | Bing : 155 times |