Relative differential Raman scattering cross section

The relative differential Raman scattering cross section of the line of the sample can,... 

Relative and ab.solute Raman scattering cross sections have been measured by a number of groups and were summarized by Schrotter and Klockner (1979). The formula for the total differential Raman scattering cross section of a vibrational-rotational band has been given in Eq. 2.4-6 the internal field factor L is equal to 1 for ga.ses, see also Sec. 3.5.4. 

Most scattering cross sections of other Raman bands were measured against the nitrogen 2-branch as standard. Therefore the relative normalized differential Raman scattering cross section ... 

Normalized differential Raman scattering cross-sections for Q-branches of vibrational bands, relative to N2 (Schrotterand Kldckner, 1979). 

Experimentally determined relative normalized differential Raman scattering cross sections for selected gases were tabulated [263]. Their averages were compiled and updated in reviews [276,277] and more recently in Table 4.3-7 of Ref. 43. The data from which the averages were calculated agree with one another to within 20 %, with few exceptions. 

Direct determination of absolute Raman differential cross sections is quite difficult and tedious work often leading to incorrect results. It is easier to measure cross sections relative to some standard. The absolute differential Raman scattering cross sections of the sample can then be straightforwardly obtained. 

The differential Raman scattering cross section of the line of a gas sample relative to that of the 2331 cm l line of nitrogen is given by [260]... 

The absolute differential Raman scattering cross section of the line of the sample can be obtained from the relative value by using the absolute scattering cross section of nitrogen as given in Eq. (8.73). 

Raman vibrational frequencies and intensities for both complexes 5 and 7 are compared in Table II. The relative Raman scattering intensities were calculated from the differential cross sections. For their evaluation we used the wavelength of 613.33 nm (105). Polarizabilities were calculated in the limit of a static perturbation. 

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