Absolute normalized Raman scattering cross section

Redefining h as the reference frequency, and - dividing this equation by u,ef h), affords the absolute normalized Raman scattering cross section (Eq. 3.5-13). It has been tabulated for several compounds by Schrotter and Klockner, 1979. Typical values for liquids excited by radiation from an argon ion laser at 488 nm are listed in Table 3.5-1. Raman scattering cross sections of gases are discussed by Schrotter in Sec. 4.3.2.3. 

Table 3.5-1 Integrated absolute normalized Raman scattering cross sections of liquids, excited with radiation of A,e/ = 487.99 nm = hef = 20487 cm (Schrotter and Klockner, 1979)...

Eysel and Bertie (1988) considered the absolute normalized Raman scattering cross section of the ring breathing vibration of liquid benzene at 992 cm a standard for the measurement of relative Raman scattering cross sections of a number of compounds. When applying it as standard they made use of a divided spinning cell , developed by Kiefer and Topp (1974). 

Eq. (8.45) shows that for an ordinary Raman experiment the absolute differential Raman scattering cross sections can be expressed in terms of derivatives of the molecular polarizability invariants a and y with respect to normal coordinates. These derivatives contain valuable information about the variation of molecular polarizability with vibrational motion. Gas-phase Raman scattering cross sections are most suited for intensity analysis since at low partial pressure of the sampling gas these quantities are not influenced by effects of intermolecular interactions, thus reflecting properties of individual molecules. 

---