Quasi elastic scattering

The incident beam normal to the interface is quasi-elastically scattered by the capillary wave with a Doppler shift at an angle determined by the following equation (Fig. 1) ... 

The capillary wave frequency is detected by an optical heterodyne technique. The laser beam, quasi-elastically scattered by the capillary wave at the liquid-liquid interface, is accompanied by a Doppler shift. The scattered beam is optically mixed with the diffracted beam from the diffraction grating to generate an optical beat in the mixed light. The beat frequency obtained here is the same as the Doppler shift, i.e., the capillary wave frequency. By selecting the order of the mixed diffracted beam, we can change the wavelength of the observed capillary wave according to Eq. (11). 

Kirillov, S. A., Spatial disorder and low-frequency Raman pattern of amorphous solid, with special reference to quasi-elastic scattering and its relation to Boson peak, J. Mol. Struct. 479, 279-284 (1999). 

Influence of Temporary Electron Trapping on Quasi-Elastic Scattering and Phonon Creation... 

The superscripts Q stands here for quasi-elastic scattering, and the subscript pre means the pre-average approximation. 

Dean P (1967) Atomic vibration in solids. J Inst Math Appl 3 98—165 De Gennes PG (1967) Quasi-elastic scattering of neutrons by dilute polymer solutions I. Free-draining limit. Physics 3(1) 37—45... 

Close to Tc, quasi-elastic scattering is in some cases useful and gives information on the fluctuations of regions of short-range order. 

The neutron quasi-elastic scattering measurements have been made from room temperature to glassy transition temperature on LAM-40 spectrometer at KENS. The details of the spectrometer and the data analysis have been described elsewhere. ... 

Quasi-elastic Scattering.—When a neutron is scattered by a liquid molecule, Doppler shifts in the neutron s energy may occur because relative motion between the neutron and the molecule can take place during the time scale of the interaction. This effect can be used to investigate the diffusion of mobile layers, such as methane and ammonia on graphite. 

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