Scattering lengths and baryon magnetic moments in a gauge model of strong and electromagnetic interactions

We present a broken SU(3) gauge model of strong and electromagnetic interactions with the usual vector mesons. All particles (9 vectors, 8 baryons and 9 pseudoscalars) have the right masses by means of the Higgs mechanism. We study the consequences of Sakuraï's idea that strong and electromagnetic interactions are mediated by vector mesons universally coupled to nearly conserved currents: one finds encouraging values for scattering lengths except for P-wave parameters in the meson-baryon sector that are too small. The calculation of the baryon anomalous magnetic moments also gives too-small numbers.     

Structural and spectroscopic comparison of methylaminophenylcarbenepentacarbonyltungsten(0) with tungsten carbonyl carbene complexes lacking a heteroatom

Summary Crystallographic and Spectroscopic data for (CO)_5– WC(NHCH₃)C₆H₅ provide evidence that there is comparatively little metal-carbene -bonding in this and other zero-valent tungsten carbonyl carbene complexes. The W-C_car bond length of 2.19(2) Å indicates that its bond order is significantly lower than 2.0. Resonances in the¹³C n.m.r. spectrum for CO w.r.t. tetramethylsilane at 195 and 215 ppm and an asymmetric CO stretching frequency of 2060 cm^–1, in addition to structural similarities, imply analogous bonding in other zero-valent tungsten carbonyl carbene complexes, including those lacking a heteroatom bonded to the carbene carbon.Portion of work done at Clemson University, Clemson, South Carolina, U.S.A.     

Acidites et complexes des acides (alkyl- et aminoalkyl-) phosphoniques—II: Affinement multiparametrique applique aux complexations suivies par potentiometrie

The determinations are based on potentiometric titration data (volume of reagent, potential). To avoid any systematic error, the acidity constants are refined together with every other significant parameter (initial protolyte concentration, concentration of impurities, electrode chain characteristics …) with the program MUPROT. Comparison of the multiparametrically adjusted results with those obtained by the usual methods reveals noticeable discrepancies. Particular attention is paid to carbonate as impurity; to take it into account, modified expressions for the titrant volume are established. The current of nitrogen used in the classical methods shifts the liquid-gas equilibrium of carbonic acid; in that case, only the approximate equations are to be considered. Working with a closed system is proposed as a more rigorous procedure.     

Energie des systèmes H2, HHe+ et LiH

The ground state and first electronic transitions energies are calculated by the OMSCF method for H₂, HHe⁺ and LiH. The basis consists in a Slater type orbitals of atoms and in a product of these. First transition energies are improved in comparison with minimal basis.     

Iron Mössbauer spectra of lava from Jeju island and its similarities to Moon basalts

We report the result of measurements of the⁵⁷Fe Mössbauer spectrum for powder samples of lava taken from four widely separated sites on Jeju island. The spectra consist of well defined quadrupole doublets having a 2+ charge state and indicate the presence of olivine, clinopyroxene, and ilmenite. In addition we find a six line magnetically split hyperfine pattern characteristic of impure hematite, with considerable line broadening and reduced internal field. The observed spectra have a remarkable similarity to those found for moon basalts. A recently popularized “collision ejection” model for the moon formation would be consistent with our observations. The data is a particularly simple and direct illustration of the well-known fact that the iron silicates and ilmenite found on the moon are very similar in composition and relative abundance to that found on earth.     

Triangular imbedding of Kn − K6

For n = 12s + 9 (s ≥ 4) we imbed K_n ? K₆ in an orientable surface of genus 12s² + 11s.