We report the laser spectroscopic characterization of bulk
monoclinic Eu3+:Y2O3, which was
prepared by a
high-temperature, high-pressure synthesis method. The bulk
monoclinic phase has sharp spectral lines without
the line broadening and “secondary phase” of
Eu3+:Y2O3 nanocrystals. The
unusual optical properties of site
A in this material have been determined to be intrinsic to the
monoclinic phase and are not a result of surface
effects in the nanocrystals. The 5D0
fluorescence lifetimes are longer in the nanocrystals than in the
bulk
material, indicating that there is no lifetime shortening in the
nanocrystals due to quenching by the proximity
of surface defects.
We report the use of infrared (IR) microspectroscopy for the analysis of fingerprint residues. The advantage of using an IR microscope lies in the ability to visualize and obtain spectra of individual particles and droplets that make up fingerprint ridge deposits at a spatial resolution of approximately 10 microm. Our initial results suggest that infrared microspectroscopy in reflection-absorption mode provides reproducible spectral analysis of fingerprint residue. Since infrared microspectroscopy is nondestructive to the sample, we will be able to study the changes in fingerprint ridge deposits as a function of time. The method holds promise for probing the difference between latent fingerprints of adults and children.
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