Research of IR spectral features caused by nanoparticle surfaces and metastable crystal structure

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There are a lot of unidentified infrared (UIR)features in the astronomical spectra. We assumed the reason that is characteristic physical parameters of nanoparticles, because no one ever considers the properties of nanoparticle, although cosmic dust has nanometer in size. To identify the UIR features, we constructed a new system, which is able to measure IR spectra of free frying as-grown nanoparticles. Our results showed that the free frying nanoparticles have different features compared with that in the spectra of bulk and nanoparticles embedded into a KBr pellets. UIR features will be identified based on our concept.