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B. Lendl:
"Stand-off spatial offset Raman scattering";
Hauptvortrag: Federation of the Analytical Chemistry and Spectroscopies Societies (FACSS), Raleigh, NC, USA (eingeladen); 17.10.2010 - 21.10.2010.

Stand off Raman scattering allows to investigate the chemical nature of objects from the distance of several meters up to hundreds of meters. In such applications the Raman scattered light is collected by a telescope whose focus is centered on the laser spot illuminating the target. By doing so it is possible to detect and identify traces of inorganic or organic substances present at the surface of objects of different kinds. One important application area of this technique is in the field of homeland security, where traces of explosive substances need to be detected from a safe distance. Conventional stand-off Raman is, however, not able to investigate the content of suspicious objects. A different variant of Raman scattering, namely spatial offset Raman scattering is able to provide depth resolved information of diffusively scattering objects. In this lecture the combination of both techniques will be presented and results shown how solid (NH4NO3) as well as liquid materials (hydrogen peroxide) inside plastic containers can be identified.

Stand off Raman scattering allows to investigate the chemical nature of objects from the distance of several meters up to hundreds of meters. In such applications the Raman scattered light is collected by a telescope whose focus is centered on the laser spot illuminating the target. By doing so it is possible to detect and identify traces of inorganic or organic substances present at the surface of objects of different kinds. One important application area of this technique is in the field of homeland security, where traces of explosive substances need to be detected from a safe distance. Conventional stand-off Raman is, however, not able to investigate the content of suspicious objects. A different variant of Raman scattering, namely spatial offset Raman scattering is able to provide depth resolved information of diffusively scattering objects. In this lecture the combination of both techniques will be presented and results shown how solid (NH4NO3) as well as liquid materials (hydrogen peroxide) inside plastic containers can be identified.