Raman theory

Myers A B 1997 Time dependent resonance Raman theory J. Raman Spectrosc. 28 389—401... 

A brief description of IR and Raman theory will be presented so that a common understanding of the techniques is available to the reader. A complete description of the underlying theory to IR and Raman spectroscopy is outside the scope of this chapter, but can be obtained from the literature [1-5]. 

The theory discussed until now is based on the Kramers-Heisenberg-Dirac dispersion relation for the transition polarizability tensor as given in Eq. (6.1-1). The expression shown in this equation describes a steady state scattering process and contains no explicit reference to time. Therefore, the resonance Raman theory which is based on the KHD dispersion relation is sometimes also termed as time-independent theory (Ganz et al., 1990). 

Based on the two approaches to continuum resonance Raman theory, many spectra of diatomic molecules could be successfully simulated (Hartke, 1989, 1991 Ganz and Kiefer, 1993a, 1994). Besides the good simulations of continuum resonance Raman band... 

Both classical and quantum mechanical treatments of Raman scattering are based on Eq. (2.1), and such treatments are very valuable in understanding the effect and interpreting spectra (1-5). One of the more analytically important results of Raman theory is the Raman scattering cross section, aj, which will be discussed at some length below. Before considering the factors that affect CT, it is useful to review several aspects of Raman theory. 

Both measurements and calculations based on Raman theory indicate that the scattering intensity is approximately proportional to the particle volume (or mass) over certain... 

Resonance Raman theory (33) predicts an enhancement of the scattering intensity, when the excitation wavelength approaches iriax th long wavelength side. This effect is clearly seen... 

In the early chapters, the principles of Raman theory, instrumentation, selection of appropriate instrumentation, important instrumental measurement parameters, the use of data for the practitioner s benefit, and extracting the important analytical information from recorded data are introduced and discussed. These early chapters, where appropriate, use specific examples to illustrate the necessary concepts. 

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