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Raman effect

  1. Dec 5, 2013 #1
    please help me i need to memorize exactly the below essay

    In 1928, Sir C.V. Raman discovered experimentally, that the
    monochromatic light is scattered when it is allowed to pass through a
    substance. The scattered light contains some additional frequencies
    other than that of incident frequency. This is known as Raman effect.
    The lines whose frequencies have been modified in Raman effect
    are called Raman lines. The lines having frequencies lower than the
    incident frequency are called Stoke’s lines and the lines having
    frequencies higher than the incident frequency are called Anti−stokes
    lines. This series of lines in the scattering of light by the atoms and
    molecules is known as Raman Spectrum.
    The Raman effect can be easily understood, by considering the
    scattering of photon of the incident light with the atoms or molecules.
    Let the incident light consist of photons of energy hνo.
    1. If a photon strikes an atom or a molecule in a liquid, part of
    the energy of the incident photon may be used to excite the atom of the
    liquid and the rest is scattered. The spectral line will have lower
    frequency and it is called stokes line.
    2. If a photon strikes an atom or a molecule in a liquid, which is in
    an excited state, the scattered photon gains energy. The spectral line will
    have higher frequency and it is called Anti−stoke’s line.
    3. In some cases, when a light photon strikes atoms or molecules,
    photons may be scattered elastically. Then the photons neither gain nor lose energy. The spectral line will have unmodified frequency.
    If νo is the frequency of incident radiation and νs the frequency of
    scattered radiation of a given molecular sample, then Raman Shift or
    Raman frequency Δν is given by the relation Δν = νο − νs.
    The Raman shift does not depend upon the frequency of the
    incident light but it is the characteristic of the substance producing
    Raman effect. For Stoke’s lines, Δν is positive and for Anti–stoke’s lines
    Δν is negative.
    The intensity of Stoke’s line is always greater than the
    corresponding Anti−stoke’s Line. The different processes giving rise to
    Rayleigh, Stoke’s and Anti-stokes lines are shown in
    When a system interacts with a radiation of frequency νo, it may
    make an upward transition to a virtual state. A virtual state is not one
    of the stationary states of the molecule. Most of the molecules of the
    system return back to the original state from the virtual state which
    corresponds to Rayleigh scattering. A small fraction may return to
    states of higher and lower energy giving rise to Stoke’s line and Antistoke’s
    line respectively.
    Applications of Raman Spectrum
    (i) It is widely used in almost all branches of science.
    (ii) Raman Spectra of different substances enable to classify them
    according to their molecular structure.
    (iii) In industry, Raman Spectroscopy is being applied to study the
    properties of materials.
    (iv) It is used to analyse the chemical constitution.

    how do i use the following methods for memorizing this:
    1.major mnemonic system
    2.peg method
    3.memory palace
    4.roman room method

    i understood everything and i tried recording the information and even flashcards but i cant recall the information
  2. jcsd
  3. Mar 20, 2014 #2
    hope this thread is closed
  4. Mar 20, 2014 #3


    User Avatar

    Staff: Mentor

    Looks to still be open. Remember what we told you, and click the "Report" button on your post and ask the Mentors to delete/close the thread.
  5. Mar 20, 2014 #4

    Doc Al

    User Avatar

    Staff: Mentor

    Why in the world would you want to do that?

    Are you familiar with these methods? If not, that's the first step. (For example, how does #1 relate to #2?)
  6. Mar 20, 2014 #5
    i want to do that because i have to exactly memorize the essay(cramming) as it is without changing a word.but unfortunately my finals physics exam is over as i told earlier.so this thread is no loner useful that is why i wanted it to be closed.
  7. Mar 20, 2014 #6


    User Avatar
    2017 Award

    Staff: Mentor

    An exam that requires word-by-word knowledge of any text (longer than maybe something like conservation laws) is not a proper physics exam. And I am sure I would see where to complain if the exam is not about physics knowledge, but about knowlege of some text someone wrote.
  8. Mar 21, 2014 #7
    but the students like it and even me.we can very easily get 100% by rote learning.so it is an easy way getting high grades in 12th grade
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