Die Verstärkung der Prädissoziation durch Stöße und das Beersche Gesetz

Zeitschrift für Physik A Hadrons and nuclei - Es wurde durch die Aufnahme des Absorptionsspektrums von gasförmigem Brom bei verschiedenen Drucken und Schichtdicken festgestellt, daß...     

Störungstheoretische Berechnung der Selbstenergie und der Masse des Polarons

The perturbation theoretical results for the self-energy and the mass of the polaron are given in 4-th order. Even for a coupling strength usually assumed in NaCl (g²=6) the deviations from the values found inFeynman's variational approach are negligible. A remark concerning the approximation character ofFeynman's method is made from the comparison of the expressions for the self-energy.     

Plasmadiagnostik mit Emittierenden Sonden Durch Ausnutzung der Örtlichen Störung des Ionisationsgleichgewichts

The emissive probe is used generally to determine exclusively the plasma potential. The emissive probes have distinct advantages over collecting probes, because several conditions which restrict the spectrum of application fall away. In this paper the methods for the determination of plasma potentials are discussed and completed by new techniques using the local perturbation of the ionization balance. On the other hand it is shown that further plasma data can be obtained exploiting the plasma response on the emitted electrons accelerated by the probe bias voltage. In this way the total ionization rate, the portion of direct ionization, the concentration of metastable atoms and the life time of metastables are determined for selected conditions.

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Presented at the Colloquium on Plasma Physics Topics Common to the Laboratory and the Space Plasma Research, September 21–25, 1987, Skalský Dvr, Czechoslovakia.     

Untersuchung des „Auroral Afterglow“ und seiner Präparationsstadien

The decay of the continuum of the air afterglow was found to be equal in the whole spectral range used. In the beginning of the afterglow [NO] is not constant. N atoms from the discharge create 0 atoms by reacting with NO and retard the intensity decay. Later [NO] remains constant during the afterglow. The decay curves measured in the nitric oxide, and the Lewis-Rayleigh stage agree with the current theories of recombination of N₂ and NO by three-body collision. If the spectral intensity distribution in the Lewis-Rayleigh afterglow is due to the action of different third bodies, asReinecke suggested, his opinion is to be improved by accepting a two step reaction. The measurements can be interpretated, if the first one is responsible to the rate and the second one to the intensity distribution. No sign could be found for the Cario-Kaplan processes to be more frequent in the neighbourhood of the exciting discharge than that of recombination. On the other hand it could be shown, that the recombination of N atoms is severely hindered by transition into the auroral stage and additional collision processes become effective in the excitation of all transitions of the 1. pos. group.     

Untersuchung des „Auroral Afterglow“ und seiner Präparationsstadien

The intensity decay of negative bands of N ₂ ⁺ and of first positive bands of N₂ in the auroral afterglow has been measured. An explanation, seeming possible for the decay curves of the first ones is proposed. By this the intensity decay in the beginning of the afterglow at high ionic densities is determined by the recombination of N ₂ ⁺ with electrons. Later, the ambipolar diffusion of the charge carriers to the wall causes the time dependance. A value of the ambipolar diffusion coefficient in nitrogen, derived from the measurements is given by the relationD _a ·p ≈ 124cm² sec^?1 Torr. The temperature of the charge carriers is estimated to be 313? K. The intensity decay of the pos. group in the afterglow seems mainly to be due to the diffusion of metastable particles to the wall.     

Untersuchung des „Auroral Afterglow“ und seiner Präparationsstadien

A special apparatus has been developed in order to produce an auroral afterglow and to measure the decay of light intensity of some afterglow emissions over several powers of ten. The preparation of different discharge tubes during which the air, the nitric oxide, and the Lewis-Rayleigh afterglow appear also is described. The corresponding spectra are given.