Cross sections and charged multiplicity distributions for π−p and K−p interactions at 147 GeV/c

The results presented in this paper were obtained from a 105 000 frame exposure of the FNAL Hybrid Proportional Wire Chamber-30 inch Bubble Chamber System, in a tagged beam of 147 GeV/c negative particles. Elastic, total and topological cross sections were obtained for both π^?p and K^?p interactions. Comparisons with other data, taken with various beam particles over large momentum intervals, show good agreement with KNO scaling, and similarity in the scaling behavior of σ_n for the different beam particles.     

Molecular SCF calculations to model (III) surface relaxation of silicon

Ab-initio SCF-MO computations in a 4–31 Gaussian basis on a molecular system Si₄H₉, designed to model a silicon atom on the (III) surface of silicon, predict that the dangling bound silicon relaxes about 0.05 Å toward the bulk from its position on an extension of the silicon crystal lattice. This relaxation is much less than earlier empirical estimates.     

Phosphorescence from an EDA complex with nitrobenzene as an electron donor

Excitation of the EDA complex formed between the donor, nitrobenzene, and the acceptor, boron trichloride, gives rise to a phosphorescence centered at 579 nm with a quantum yield of 2.3 ± 0.1 × 10^-3, which is assigned to the charge transfer triplet state of the complex. The formation constant of the complex was determined to be 50 ± 15 M^-1 at 77 K. Photochemical quantum yield data at room temperature for the photoreduction of nitrobenzene as the nitrobenzene-boron trichloride complex to nitrosobenzene indicates reactivity increasing with boron trichloride concentration. A comparison of the phosphorescence and electrochemical data for the 1:1 EDA complexes between nitrobenzene, benzophenone and pyridine and boron trichloride predicts that the oxidation potentials for nitrobenzene and benzophenone are +1.32 and +1.63 V vs. the saturated calomel electrode, respectively, and reflect the availability of a non-bonding electron pair for complexation.     

Novel ionic liquid electrolyte for electrochemical double layer capacitors

A novel oxygen containing spiro ammonium salt, oxazolidine-3-spiro-1’-pyrrolidinium tetrafluoroborate (OPBF₄) was synthesized using an innovative technique for use as electrolyte in electrochemical double layer capacitors (EDLC). Comparison of OPBF₄ with commercially available, tetraethyl ammonium tetrafluoroborate (TEABF₄) showed higher voltage window and higher capacitance for the OPBF₄ compound. Moreover, molarity of 3 M was produced with OPBF₄ as compared to a maximum of 1.5 M for TEABF₄ in acetonitrile (AN). This is especially important to enable the fabrication of higher energy density EDLC. This is the first report of testing OPBF₄ compound in an EDLC device, and it qualifies as a reasonable alternative to TEABF₄ for high performance ultracapacitors.     

Effect of air and oxygen content on the dielectric barrierdischarge decomposition of chlorobenzene

Experiments were performed on the plasma-assisted decomposition of dilute concentrations of chlorobenzene in air/oxygen and argon/oxygen gas mixtures at atmospheric pressure using a coaxial geometry single dielectric barrier discharge for different oxygen concentrations and energy densities. The results show that the decomposition process requires higher energy densities using air mixtures compared to argon/oxygen mixtures and is not linearly dependent on the oxygen content for a given energy density. The main decomposition products detected in the offgas were carbon dioxide and carbon monoxide