Light scattering is a term referring to physical processes involving the interaction of light and matter. Due to this interaction light incident on an ensemble of particles — crystals, aerosols, molecules, atoms etc. — is partially “deflected” in directions deviating from the incident direction. In some scattering processes, in addition to the change in direction, there is also a change in frequency. The evaluation of the scattered light with regard to its intensity and its wavelength often yields valuable information about the scattering matter. In an experimental setup a laser is usually used as the incident light source and light detection devices are placed at specific angles to the incident direction, depending on the physical effect employed. Schematically this is shown in Fig. 9.1. In most cases beside the light source and the detectors other optical elements such as mirrors, filters, beam splitters etc., are placed in the beam paths to fulfil the requirements of the specific application.
KeywordsInelastic Scattering Vibrational Level Laser Induce Fluorescence Ground Electronic State Rayleigh Scattering
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