In this research Calcium fluoride nanoparticles and its different amount of cerium ion dopant (5%and 10%) were prepared. The mentioned nanoparticle were studied by fourier transform infrared spectroscopy (FTIR) , X-ray diffraction (XRD), absorption and photoluminescence spectra (PL) and Scanning electron microscopy (SEM). The XRD patterns indicate a typical cubic fluorite structure and no other...

CONTENTS Introduction Ultraviolet and Visible Spectroscopy Nature of Electronic Transitions Principles of Absorption Spectroscopy Spectral Measurements Solvent Effects Applications of Electron Spectroscopy Commercial Applications of UV and Visible Spectroscopy Infrared Absorption Spectroscopy Hooke’s law and Absorption of Radiations Modes of Molecular Vibrations Other Factors influencing Vibrat...

In this work, a defect based photonic crystal (PC) structure presented for design of tunable infrared photodetector. Absorption response was investigated under the effects of various structural parameters. Using straight transfer matrix method, PC band edge effect was studied on absorption and a significant absorption enhancement up to %96 was achieved for defect-based structure.

We analyzed the mid-infrared spectra of 4 optical carbon stars and 4 candidates of infrared carbon stars obtained with the ISO SWS. It has been revealed that special care should be taken in determining the continuum levels for the analysis of the emission and absorption bands of HCN and C2H2 at 14 μm; otherwise the SiC emission at 11 μm as well as molecular absorption at 7.5 μm may lead to the ...

we report the growth by ion exchange synthesis of zns nanoparticles in mcm-41 matrices using zn (ch3coo)2 and na2s starting sources. the final product (zns/mcm-41) was characterized by x-ray diffraction (xrd) pattern, transmission electron microscopy (tem), scanning electron microscopy (sem), infrared spectrometry (ir) and uv-vis spectroscopy. its crystalline structure and morphology was studie...

Plasmonic nanostructures for unifying surface enhanced Raman and Infrared Absorption spectroscopy

We analyze the qualitative features in the transition spectra of a model superconductor with multiple energy gaps, using a simple extension of the Mattis-Bardeen expression for probes with case I and case II coherence factors. At temperature T50, the far-infrared absorption edge is, as expected, determined by the smallest gap. However, the large thermal background may mask this edge at finite t...