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Ultraviolet photoelectron spectroscopy (UPS) has been applied to the investigation of the electronic structure of oligothiophenes with 4–8 thiophene rings. In a series of α-linked oligomers (αn with n being the number of rings), a systematic evolution of the π band is observed. Several peaks which correspond to the π…
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Thermally stimulated polarization and depolarization current (TSPC/TSDC) measurements were made on lead halide silicate glasses having compositions (65 − x )PbO· x PbX 2 ·35SiO 2 where x = 0, 0.1, 2, 10 and X = F, CI, Br, and I. The addition of halogen ions to lead silicate glasses gives rise to a new high‐temperature…
Equilibrium constants are reported for reaction of Lewis bases, including H2O, with ( thf )( tpp ) CrOFe ( salmah ) in tetrahydrofuran and toluene solutions [ tpp = dianion of 5,10,15,20- tetraphenylporphyrin ; salmah = dianion of N,N?-(4-methyl-4-azaheptane-1,7-diyl) bis ( salicyli - deneimine )]. Mossbauer spectra o…
It is shown that high‐quality IR specular reflectance spectra can be obtained from polished surfaces of dense ceramics. The reflectance spectra can be deconvoluted by the Kramers‐Kronig transformation to yield absorption spectra or the real and imaginary parts of the dielectric function. IR line shapes and peak wavenu…
Disordered crystals show excess absorption in the far infrared and millimetre range in addition to one- and multi-phonon absorption processes. The effect is investigated in non–ferroelectric order-disorder systems (KSCN, NH4Br:) and in weakly disordered and modulated improper and pseudoproper ferroelectrics ((NH4)2SO4…
Abstract Surface‐enhanced Raman scattering of cytosine, cytidine, 2′‐deoxycytidine, and cytidine 5′‐monophosphate (5′‐rCMP) in silver sol was investigated. Cytosine seemed to adsorb on the silver surface as the neutral form. With cytosine and 5′‐rCMP, their orientations with respect to the surface changed from a horiz…
Research carried out to investigate the dependence of the strength of external insulation on air density is described, with particular reference to positive polarity impulses, generally of major interest for design and testing. New tests were carried out up to an altitude of about 3000 m above sea level, with particul…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal-assisted CO insertion reaction on a new surface rhodium dimer catalyst observed by an in situ EXAFS techniqueK. Asakura, K. Kitamura-Bando, K. Isobe, H. Arakawa, and Y. IwasawaCite this: J. Am. Chem. Soc. 1990, 112, 8, 3242–3244Publication Date (Print):April 1, 1990Pub…
A description is given of an optoelectronic system for detecting and locating corona discharges in SF/sub 6/-filled gas-insulated systems (GIS). The system consists of optical fiber links, photomultiplier light detectors, an operational amplifier, and a computer-based data collection system. Various factors that can i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlkylated styrene ionomers with variable length spacers. II. Physical propertiesMario Gauthier and Adi EisenbergCite this: Macromolecules 1990, 23, 7, 2066–2074Publication Date (Print):April 1, 1990Publication History Published online1 May 2002Published inissue 1 April 1990h…
Bhatia & Thornton [ Phys. Rev. B. (1970), 2 , 3004–3012] have derived the formula that relates the scattering intensity of a binary system to the Fourier transform of the local number density and concentration. For the intensity at the limit of zero scattering angle, the same formula can be derived by a much simpl…
Abstract The thermal conductivity λ and thermoelectric figure of merit z of Sb films with thicknesses from 27 to 230 nm are measured in the temperature range 80 to 400 K. The lattice thermal conductivity λ φ is determined from the measured total thermal conductivity λ and the calculated charge carrier contribution λ e…
This manuscript reports an atmospheric electrochemical monitor (ATMEIS) designed to assess degradation of painted metal substrates during atmospheric exposure using electrochemical impedance spectroscopy (EIS). The monitor consists of a painted steel coupon upon which a gold electrode is electron-beam-deposited to ser…
Abstract A series of Cu‐Ni alloys, ranging from 30 to 90% copper was studied by electrochemical methods in 3.5% sodium chloride solution and in sea water. The composition of the corrosion layer and of the solution after various immersion times was determined by chemical methods and X‐ray diffraction. The results are c…
The anomalous scattering factors g' , g" for forward scattering are generated for neutral Ne and for Ne 2+, 4+, 6+ and 7+ ions, utilizing a dispersion relation integration method, for photon energies from 1 to 70 keV. Photoionization cross sections (i.e., g" ) above threshold are calculated in the relativistic Hartree…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric normal mode process in binary blends of polyisoprene. 2. Dynamic behaviorKeiichiro Adachi, Shigeru Itoh, Isao Nishi, and Tadao KotakaCite this: Macromolecules 1990, 23, 9, 2554–2559Publication Date (Print):April 1, 1990Publication History Published online1 May 200…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTScaling theory of molten polymers in small poresF. Brochard-Wyart and E. RaphaelCite this: Macromolecules 1990, 23, 8, 2276–2280Publication Date (Print):April 1, 1990Publication History Published online1 May 2002Published inissue 1 April 1990https://pubs.acs.org/doi/10.1021/…
Abstract Clay fractions separated from the A2, B, and C horizons of a soil formed on granite gneiss showed X-ray powder diffraction (XRD) spacings characteristic of trioctahedral illite. The trioctahedral illite was derived from biotite, and its development through various stages of weathering was followed by optical…
K 2 [ReCl 6 ] (I), a 120 K, cristallise dans Fm3m, avec a=9,7958 A, Z=4; affinement jusqu'a R=0,0219. K 2 [OsCl 6 ] (II), a 120 K, cristallise dans Fm3m, avec a=9,7195 A, Z=4; affinement jusqu'a R=0,0194. K 2 [PtCl 6 ] (IIIa, b) cristallise dans Fm3m, avec (IIIa) a=9,6911 A, Z=4; affinement jusqu'a R=0,0159; (IIIb) a=…