Download The Raman Effect A Unified Treatment of the Theory of Raman by Derek A. Long PDF

By Derek A. Long

Offers a unified theoretical remedy, that's whole and rigorous yet still readable. The theoretical therapy calls for a number of mathematical and actual instruments. to maintain the most textual content uncluttered, those instruments are constructed in finished Appendices to which cross-references are made mainly textual content. those Appendices additionally make sure that the most textual content comes in handy to readers with a large choice of clinical backgrounds and adventure. those contain not just spectroscopists, but in addition chemists, physicists, biochemists and analytical chemists. The presentation is such that postgraduate and postdoctoral scholars in addition to extra verified learn employees will locate it important.

in regards to the writer the writer was once previously Professor of Structural Chemistry and Director of the Molecular Spectroscopy unit within the collage of Bradford. he's special for his unique clinical paintings in a couple of parts of Raman spectroscopy. His publication, 'Raman Spectroscopy', released in 1978 and lengthy out of print, used to be hugely winning. He has been co-editor of many books together with the expert experiences on Molecular Spectroscopy, released by means of the Royal Society of Chemistry; he retired as Editor-in-Chief of the magazine of Raman Spectroscopy in December 1999.

 

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Extra resources for The Raman Effect A Unified Treatment of the Theory of Raman Scattering by Molecules

Example text

The words of the French poet Val´ery come to mind: ‘il y a deux dangers mortel pour l’homme, l’ordre et le d´esordre’. I hope the treatment in this book avoids these two dangers. 10 HISTORICAL PERSPECTIVE Curiosity about the explanation of the blue colour of the sky led Lord Rayleigh to formulate a classical theory of light scattering without change of frequency (Rayleigh, 1871). Survey of Light-scattering Phenomena 17 Fascination with the marvellous blue of the Mediterranean sea caused C. V. Raman to investigate the scattering of light by liquids and so to discover experimentally the scattering of light with change of frequency (Raman and Krishnan, 1928).

From such considerations emerge the special properties of CARS and CSRS radiation which we have just outlined. Here we just concern ourselves with energy considerations taking CARS as an example. The process involved is the annihilation of one photon of energy h¯ ω1 , creation of a photon of energy h¯ ω2 , annihilation of a second photon of energy h¯ ω1 and scattering of a second photon of energy h¯ ωs D h¯ ω1 C ωM . It is readily seen that the photon energies are selfbalancing as h¯ ω1 C ω2 ω1 C ωs D 0 since ωs D 2ω1 ω2 .

The interaction of the radiation with the material system can also result in the creation of a photon of energy h¯ ω1 and annihilation of a photon of energy h¯ ω2 , so that the radiation now consists of n1 C 1 photons each of energy h¯ ω1 and n2 1 photons each of energy h¯ ω2 . The scattered radiation now has a frequency of ωs D ω1 and energy conservation requires that Ef D Ei h¯ ω1 ω2 D Ei h¯ ωM . The overall process represents a loss of intensity at the Stokes Raman frequency ω2 and is termed a stimulated Raman loss process.

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