Scattering inelastic nonlinear

SF radiation may be accompanied with inelastic nonlinear scattering, although the scattering cross section is extremely small, typically in the order of 10 cm" per molecule. Such an inelastic scattering effect in the second-order nonlinear optical... 

Cyvin, S. J., Rauch, J. E. and Decius, J. C. (1965) Theory of hyper-Raman effects (nonlinear inelastic light scattering) selection rules and depolarization ratios for the second-order polarizability. 

Raman spectroscopy comprises a family of spectral measurements based on inelastic optical scattering of photons at molecules or crystals. It involves vibrational measurements as well as rotational or electronic studies and nonlinear effects. Following, Raman will be used in the established but slightly inaccurate way as a synonym for the most important and most common technique of the family, linear vibrational Raman scattering. 

The interaction can be described as an inelastic scattering of a pump photon, hcop by the nonlinear medium, in which the pump photon is absorbed and two new photons,... 

Inelastic (shifted) scattering Gas Raman Fluorescence Nonlinear processes Temperature and component densities Nonequilibrium OK Wide range of signal strengths and complexities to obtain detailed data from various systems, including hostile environments... 

The inelastic processes - spontaneous Raman scattering (usually simply called Raman scattering), nonlinear Raman processes, and fluorescence - permit determination of species densities as well as temperature, and also allow one, in principle, to determine the temperature for particular species whether or not in thermal equilibrium. In Table II, we categorize these inelastic processes by the type of the information that they yield, and indicate the types of combustion sources that can be probed as well as an estimate of the status of the method. The work that we concentrate upon here is that indicated in these first two categories, viz., temperature and major species densities determined from vibrational Raman scattering data. The other methods - fluorescence and nonlinear processes such as coherent anti-Stokes Raman spectroscopy - are discussed in detail elsewhere (5). 

A generalization of biphonon theory beyond the Van Kranendonk model was made later (14)—(17). Subsequently, the effect of biphonons on polariton dispersion in the spectral region of two-particle states was investigated in a number of papers (18)—(22), and the contribution of biphonons to the nonlinear polarizability of a crystal was discussed in (23)-(25). Problems of the theory of local and quasilocal biphonons in disordered media were discussed in a number of papers (14), (26) -(28). The influence of anharmonicity in crystals on the spectra of inelastically scattered neutrons was considered by Krauzman et al. (29), Prevot et al. (30), and in Ref. (31). 

The optical parametric oscillator (OPO) [5.288-5.295] is based on the parametric interaction of a strong pump wave EpCos(cypt —fcp-r) with molecules in a crystal that have a sufficiently large nonlinear susceptibility. This interaction can be described as an inelastic scattering of a pump photon hcop by a molecule where the pump photon is absorbed and two new photons hcos and hco[ are generated. Because of energy conservation, the frequencies o) and are related to the pump frequency n>p by... 

Figure 7.1 Energy level transitions for different vibrational spectroscopic techniques infrared absorption. SFG nonlinear spectroscopy. Raman and HREELS iwhere an electron is inelastically scattered .

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