Triplet photosensitization and the photobiology of thymine dimers in DNA
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The Role of Internal Stress in the High-Temperature Deformation of Copper
Polycrystalline copper of 99·99% purity has been deformed in tensile creep at a variety of strain rates and temperatures. The internal stress developed during creep deformation was measured by a modified stress-relaxation technique. The magnitude of the internal stress remains constant during steady-state deformation…
An infrared study of co-ordinated BH3 and BH2 groups as proton acceptors in hydrogen bonding
Boron co-ordination compounds of the type L,BH3(L = Me3N, Et3N, Py, and Et3P) and Me3N,BH2X (X = Cl, Br, and I) are shown to form hydrogen-bonded complexes with OH (MeOH, PhOH, and p-F·C6H4·OH) in carbon tetrachloride solution. These complexes appear to be formed via OH ⋯ BH3 and OH ⋯ BH2 interactions and are readily…
Electronic energy levels in hexahalotellurate(IV) complexes
The electronic spectra of the octahedral Tecl_6^(2-) and TeBr+6^(2-) complexes are reported and assigned. \nThe s → p transition a_(lg)σ^* → t_(lu)σ^* gives rise to three spin-allowed bands in TeCl_6^(2-) (32,880; 34,480; 35,680 cm^(-1)) and TeBr_6^(2-) (28,470; 29,730; 30,850 cm^(-1)). These data are taken as evi…
Luminescence of Divalent Europium in Ba-Ca, Ba-Sr, and Ca-Sr Orthophosphate and Pyrophosphate Compositions
Divalent europium was used as an activator in Ba‐Ca, Ba‐Sr, and Ca‐Sr orthophosphate and pyrophosphate compositions. Luminescence was observed in most of the compositions and spectral energy distribution measurements were made on all samples. Changes in the mixed cation ratios produced variations in emission band inte…
Jahn‐Teller Effect and Partially Covalent Bond as Causes of Low Symmetry of Ga+, In+, and Tl+ Centres in CsCl‐Type Alkali Halides
Abstract Partially polarized luminescence is observed for Ga + , In + , and Tl + centres in alkali halides of CsCl‐type structure at liquid nitrogen temperature. The symmetry of excited Ga + , In + , and Tl + centres is established to be tetragonal in the most crystals investigated. The symmetry of Tl + centres in CsI…
Direct fiber formation and fiber properties of aromatic polyoxadiazoles
Abstract A novel and simple fiber formation process has been developed to fabricate aromatic polyoxadiazoles. The aromatic copolyoxadiazole solution prepared from terephthalic acid, isophthalic acid, and hydrazine sulfate in fuming sulfuric acid was utilized directly as spinning solution and was successfully wet‐spun…
Polynuclear nitrido-complexes of osmium, ruthenium, and iridium
The preparation and physical properties are reported of a number of new binuclear µ-nitrido-complexes of osmium and ruthenium, of the form [M2IVNX8(H2O)2]3–(M = Os or Ru; X = Cl or Br); [Ru2N(NCS)8(H2O)2]3–; [Ru2N(NO2)6(OH)2(H2O)2]3–; [Os2N(NH3)8X2]3+(X = Cl, Br, l, NCS, NO3, or N3); [Ru2N(NH3)8X2]3+(X = Cl, Br, or NO…
Single-crystal electronic and electron spin resonance spectra of dichlorobis-(2-methylpyridine)copper(II)
The single-crystal polarised electronic and e.s.r. spectra of dichlorobis-(2-methylpyridine)copper(II) have been measured. The single-crystal g-values correlate with the monomeric local copper(II) co-ordinate axes and not with the co-ordinate axes of the dinuclear copper(II) species; they suggest a dx2–y2 ground state…
Zur Kristallstruktur von Lanarkit, Pb2O(SO4)
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Influence of Soil Salinity on Production of Dry Matter and Uptake and Distribution of Nutrients in Barley and Corn: II. Corn (Zea mays L.)1
Abstract The production of dry matter and the uptake of nutrients by corn ( Zea mays L.) from soil adjusted to different levels of salinity with a mixture of salts were evaluated and compared with results obtained with barley ( Hordeum vulgare L.). Soil salinity levels ranging from EC values of 0 to 16 mmhos/cm of the…
Thermochemistry and the Oxidation of Refractory Metals at High Temperature
Recent developments in the thermochemical data for the condensed oxide phases and volatile oxide species for the refractory metals has made possible an analysis of the several types of high temperature oxidation processes. The analyses show the following factors to be important: (1) the presence or absence of oxide fi…
A thin twin and its interaction with a coherent twin boundary in copper
An electron microscope investigation has been conducted of a thin twin intersecting an existing coherent twin boundary (CTB) in copper. The twin crystallography and dislocations associated with it and its interaction with the CTB have been experimentally determined. It appears that when a twinning dislocation intersec…
Structures et propriétés magnétiques des orthocobaltites de terres rares TCoO3
Dans les orthocobaltites de terres rares TCoO3, de structure pérovskite déformée, l'ion Co3+ est diamagnétique ; pour T = Tb, Dy, Ho un ordre antiferromagnétique de type AG s'établit à très basse température : on précise le mécanisme de métamagnétisme, la variation de la température de Néel avec la direction d'un cham…
Steady-State Chemical Potential Profiles in Solid Electrolytes
Steady‐state chemical potential profiles in a solid electrolyte under open‐ circuit and ion‐blocking conditions, may be obtained by balancing the steady‐ state flux at points inside the electrolyte. Steady‐state oxygen chemical potential profiles inside a scaling layer of thoria and inside yttria‐doped thoria specimen…
Single-crystal Raman spectra of arsenolite (As4O6) and senarmonite (Sb4O6). The gas-phase Raman spectra of P4O6, P4O10, and As4O6
The observed fundamentals of the cubic form of As4O6(arsenolite) are unambiguously assigned from single-crystal measurements. Data are also reported for the isomorphous senarmonite (Sb4O6) which (in the mineral) contains small quantities of the orthorhombic polymorph valentinite (Sb4O6). The gas-phase Raman spectra of…
Some properties of the ferroelectric lithium thallium tartrate
Lithium thallium tartrate monohydrate is ferroelectric below 12 ± 0.1°K. Contrary to earlier measurements, the true initial permittivity shows a peak at the transition temperature. Dielectric measurements suggest the transition to be second order. Below T0 there is evidence of a domain wall contribution to ε which per…
Analysis of Energy Transfer and Infrared-to-Visible Conversion in LaF3:Yb, Er
A model of the energy transfer between Yb3+ and Er3+ in LaF3 which explains the efficiency and time dependence of the conversion of infrared excitation to visible emission in this material is presented and analyzed. It is concluded that in La0.86Yb0.12Er0.02F3 the probability of an excited Yb3+ ion transfering its ene…
A new metal( II ) phthalocyanine structure: X-ray and Mössbauer studies of the triclinic tin( II ) phthalocyanine
The metal atom in the triclinic tin(II) phthalocyanine is 1·11 Å out of the plane of the four co-ordinating nitrogen atoms; the phthalocyanine moiety is significantly non-planar.
Combined pyrolysis and radiochemical gas chromatography for studying the thermal degradation of epoxy resins and polyimides. I. The degradation of epoxy resins in nitrogen between 400°C and 700°C
Abstract The thermal degradation of a bisphenol A‐based epoxy resin (EP 274) cured with 4,4′‐diaminodiphenyl methane (DDM) and with phthalic anhydride (PA) was studied using a radiochemical pyrolysis gas chromatography technique. Conclusive evidence for some of the degradation mechanisms of these resins was obtained b…