Kinetic measurements by variable-temperature photoelectron spectroscopy. The kinetic rate of the bicyclopentadiene to cyclopentadiene reaction in the medium-vacuum region

Using an appropriate reactor and variable-temperature photoelectron spectroscopy (VTPES), the kinetic rate-constant for the duration of bicyclopentadiene to cyclopentadiene is determined as approximately 1.9 s^?1 at 328°C and 0.1 torr. The study constitutes the first application of photoelectron spectroscopy to the quantitative investigation of chemical reactions. The technique might prove useful for the study of thermal decomposition reactions in the medium-vacuum region.     

Diffusion von Protonen (Tritonen) in Eiskristallen

The diffusion coefficient of tritons in ice crystals has been measured at different temperatures between 0°C and ?35°C. The applied method excludes any surface diffusion. The absolute value of the diffusion coefficient at ?7°C was determined as 2·10^?11 cm²/sec (±10%) and the activation energy as 13,5 kcal/mole (±8%). The activation energy of proton (triton)-diffusion is therefore consistent with the activation energy found for the dielectric and mechanical relaxation of protons in ice. The importance of this consistency relative to the diffusion mechanism is discussed.     

Partialsynthese eines stereochemisch einheitlichen bacteriochlorophylls D

The main problem in the synthesis of a stereochemically pure bacteriochlorophyll d is the separation of two “epimeric” key intermediates. This can be achieved by chromatography on a silica gel column coated with the optically active electron acceptor compound (+)-TAPA ($\text{7}$). The purity of the epimers thus obtained is proven by ¹H-n.m.r.-spectra.     

Die experimentelle Bestimmung der Neutronenstreulänge für das Wismutatom mit Hilfe der Totalreflexion an einem flüssigen Wismutspiegel

We construct generalized HF- and HB-equations fitted for building the symmetry properties of the Hamiltonian into. Therefore we use the method of Green's functions for condensed systems. The structure of HF- and HB-equations is conserved, only the density and pairing matrices change. Physical quantities may easily be calculated.     

Zur protonischen Leitfähigkeit von Eis-Einkristallen bei tiefen Temperaturen und hohen Feldstärken

In the course of an investigation of the electrical conductivity of ice single crystals a technique was developed for achieving electric fields of 450 kV/cm at low temperatures. Protons were injected into the sample from specially designed Pd electrodes. TheI – V (current-voltage) characteristics were found to resemble those due to space-charge limited currents which are well known inelectronic semiconductors. The concentration and depth of proton-traps, and the temperature dependence of the proton mobility were studied over a temperature range with a lower limit of 77°K. On the basis of these observations a number of mechanisms are proposed which contribute to the proton conductivity.     

Thermally driven acoustic oscillations,part III: Second-order heat flux

Summary The second-order heat flux in thermally driven oscillations of gas columns is calculated and given in a form suitable for numerical evaluation. Order-of-magnitude estimates are made in the case of steep temperature gradients.

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Zusammenfassung Der Wärmestrom zweiter Ordnung, der in thermisch getriebenen akustischen Schwingungen einer Gassäule entsteht, wurde berechnet und ist in einer für numerische Rechnungen geeigneten Form angegeben worden. Die Grössenordnung des Effektes wurde für steile Temperaturgradienten abgeschätzt.