A new approach to variational CI calculations on systems containing non-interacting molecules

A new method to perform variational CI calculations on systems containing non-interacting molecules is presented.     

On the decay of θ mesons in charmonium models

We derive a new formula for the decay rate of the ψ mesons by properly treating the dependence of lowest order electromagnetic annihilation on the quark-antiquark bound state wave function. Results are presented for currently used non-relativistic potentials models for charmonium. In all cases substantial corrections to previous estimates from commonly used formulas occur. Our results are of relevance also for hadronic decay via gluons in QCD and weak decay of pseudoscalar mesons.     

Surface and interface dipoles on catalytic metal films

The work function changes introduced by hydrogen on the surface and at the metal-support interface of a thin Pd-film were studied by simultaneous Kelvin probe and C(V)-measurements. It is demonstrated how these techniques can be used at atmospheric pressures to yield information about catalytic metals and on chemical kinetics on the metal surface. The main purpose of the communication is to point out the correlation between the surface and interface dipoles on catalytic metal films. Furthermore since the interface dipole is only created by hydrogen atoms it is shown how this can be used in a more complex situation to independently monitor the hydrogen content of the metal films.     

On two dimensional energy bands in organic materials

It is shown that the high trap densities associated with many organic materials may lead to the presence of trap energy bands similar to impurity bands in semiconductors. The possibility of a (high) two dimensional conductivity in certain materials is discussed.     

Wellenmechanische absolutrechnung am HeHHe+

The wave function of the HeHHe⁺ molecule has been calculated by means of the GENERAL SCF –MO –LC (LCGO ) PROGRAM SYSTEM, taking all four electrons into account. The calculations were carried out for a number of linear equidistant, linear non-equidistant, and bent nuclear arrangements. The minimum energy of ?5.7930 a.u. was found for a linear equidistant configuration with a He? H distance of 0.939 Å. The corresponding ionization energy was 37.9 eV. An estimation of the energy of formation of HeHHe⁺ from HeH⁺ and He based on SCF -calculations on HeH⁺ and He gave 7.9 kcal/mole. The frequencies of the normal vibrations were calculated.     

The Bi(d,γ)Po reaction

The yield of the ²⁰⁹Bi(d, γ)^211g.s.Po and ^211mPo (T_1/2 = 25.2s) reaction was measured for deuteron energies E_d = 8–11.5 MeV. The reaction was identified by the -activities of the Po isotope. At E_d = 10.43 MeV, the (d, γ) cross section for the population of the ground state of ²¹¹Po is σ_g.s. = 16 ± 3 μb, the ratio relative to the cross section for the metastable state is σ_g.s./σ_m = 25.4 ± 0.9. These values and the yield curves were compared with calculations using a simple model for the population of the two states. In the excitation region E* = 15–19 MeV, the branching ratio of γ- to particle emission is nearly constant and has a value of about 0.4 × 10⁻⁴.     

A direct determination of the nuclear ground-state spin of156Eu

The nuclear ground-state spin of the doubly-odd nucleus¹⁵⁶Eu has been measured directly using ABMR techniques to be I=0, thus distinguishing between the contradicting results obtained in beta-decay and nuclear orientation measurements.     

Radiative corrections to pseudoscalar meson decays

Recoupling matrix elements are evaluated in the harmonic oscillator approximation for all possible angular and radial excitations in processes where quarks recombine. A diagrammatic representation is given. Their use is demonstrated in calculating the transition potential for ρ→2π in a pair creation model.