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1 results

  • 7 - Raman Spectroscopy

  • Robert P. Lucht, Purdue University, Indiana
  • Book:
    Fundamentals of Laser Spectroscopy for Atoms and Diatomic Molecules
    Published online:
    12 December 2024
    Print publication:
    19 December 2024, pp 259-305

  • Summary

    Raman scattering spectroscopy is widely used in analytical chemistry, for structural analysis of materials and molecules and, most importantly for our purposes, as a gas-phase diagnostic technique. Raman scattering is a two-photon scattering process, and the mathematical treatment of Raman scattering is very similar to the mathematical treatment of two-photon absorption. Many of the molecules of interest for quantitative gas-phase spectroscopy are diatomic molecules with non-degenerate 1Σ ground electronic levels, including N2, CO, and H2. In this chapter, the theory of Raman scattering is developed based on Placzek polarizability theory and using irreducible spherical tensor analysis. Herman–Wallis effects are discussed in detail. The chapter concludes with detailed examples of Raman scattering signal calculations.