the northwestern part of the kerman cenozoic magmatic arc (kcma) contains many areas with porphyry copper mineralization. in this research, we used the advanced space-borne thermal emission and reflection radiometer (aster) and enhanced thematic mapper plus (etm+) images of this region to map the distribution of hydrothermally altered rocks, based on their mineral assemblages. the spectral meas...

Addition of 1 equiv of LiN═C(t)Bu2 or LiN═Ad (Ad = 2-adamantyl) to the aryl carbodiimide C(NDipp)2 (Dipp = 2,6-diisopropylphenyl) readily generates the lithium ketimine-guanidinates Li(THF)2[(X)C(NDipp)2] (X = N═C(t)Bu2 (1-(t)Bu), N═Ad (1-Ad)) in excellent yields. These new ligands can be readily metalated with iron to give the N,N'-bidentate chelates [{(X)C(NDipp)2}FeBr]2 (X = N═C(t)Bu2 (5-(t)...

mono and bis hexamethylenetetramine iron(iii) chloride, fe(n c ,h ) ci (i) and fe(n c ,h ) cl (ii) were synthesized by the reaction of iron(iii) chloride and hexamethylenetetramine (hmta) in chloroform. chemical analysis and spectral results show the coordination of hmta to the iron(iii). electronic transition spectra of compound i and i1 were also studied in coordinating and noncoordinating so...

Laboratory absorption spectra of peroxyacetyl nitrate (PAN, CH3C(O)OONO2) vapour have been measured in the mid-infrared range 550 cm−1 to 1400 cm−1 (18.2 to 7.14μm) at both 250 K and 273 K, using a Fourier transform infrared spectrometer at a nominal spectral resolution of 0.25 cm−1 (unapodised). In addition, the 1600 cm−1 to 2200 cm−1 (6.25 to 4.54μm) spectral region has been measured at 250 K...

the present work comprises the synthesis of one series of diarylmethane dyes containing one or more terminal methoxy substituents together with a variable tertiary amino group. the electronic absorption spectra of the dyes have been determined. as the conjugation of the terminal nitrogen atom improves in the sequence nmez > kairoline > julolidine, a progressive hypsochromic shift is observed

We report optical-absorption, photoluminescence (PL), and picosecond photoinduced absorption (PA) decay in films of poly-3-hexyl-thiophene at pressures up to 80 kbar. The spectral bands redshift nonlinearly with pressure and the PL intensity decreases markedly. Thermochromic transitions are completely inhibited at pressures as low as 14 kbar. The picosecond recovery of the PA decay at high pres...

Liquid crystal (LC) based photonic devices are important in light modulated applications including amplitude modulation and phase modulation. [Yang et al. (2006)] The anisotropic properties of LC result in employing two polarizers in most of LC devices. The optical efficiency (~3%) and the viewing angle are limited. Therefore, it is highly desirable to develop polarizer-free LC devices. [Yang e...

In this paper we describe in detail a general and efficient methodology, based on the perturbed matrix method and molecular dynamics simulations, to model UV-Vis absorption and emission spectra including vibrational and conformational effects. The basic approximation used is to consider all the chromophore atomic coordinates as semiclassical degrees of freedom, hence allowing the calculation of...

— In tungstate and molybdate crystals having scheelite structure various (intrinsic and extrinsic) hole and electron centres are created by X-irradiation at liquid nitrogen temperature. Several of these centres have been thoroughly investigated by electron paramagnetic resonance (EPR) measurements. Their thermal decay and optical bleaching, resp., can be related to glow peaks of thermoluminesce...

Cu (II) and Ni (II) complexes of general composition [ML2]X2 (M = Cu(II), Ni(II); X = Cl, NO3) were synthesized by the condensation of metal salts with semicarbazone / thiosemicarbazone derived from pdimethylaminobanzaldehyde. The metal complexes were characterized by elemental analysis, molar conductance, magnetic susceptibility measurements, IR and atomic absorption spectral studies. On the b...