Homogenitätskriterien für festkörper analytische untersuchungen

Homogeneity is a relative characteristic of samples. Both the precision and the geometrical resolving power of the investigation procedure are decisive for the characterization of homogeneity. A relation is given between these procedural parameters and the characteristics of the samples. The relationship has been verified by investigations of various heterogeneous materials by means of electron-probe microanalysis.     

Exact summation of outer rainbow self-energy graphs in λφ2ϕ2 theory

We use momentum space techniques to sum the complete class of outer rainbow graphs contributing to the IPI two-point function in λφ²?² theory. The results are exact to all orders of λ and for all values of q². By working in momentum space, we avoid the ambiguities which arose in the configuration space treatment of earlier work. It is shown that the renormalized integral equation can be reduced to a Volterra equation with $\text{non}\text{-}\text{L}{}^2$ kernel. The solution is found to agree with the asymptotic results of our configuration space treatment. Properties of the solution such as uniqueness, cut-off dependence, relation to perturbation theory and anomalous ultraviolet behaviour are discussed.     

Simultaneous determination of temperature and OH-concentration in flames using high-resolution laser-absorption spectroscopy

The development of tunable cw dye lasers with an extremely narrow bandwidth of <20 MHz and high stability in frequency and amplitude, which operate in the wavelength region from 2800 to 3150 Å by frequency doubling, has made possible the quantitative proof of the presence of OH with high-resolution laser-absorption spectroscopy.A method is presented, which allows the simultaneous measurement of temperature and OH-concentration by tuning across a suitable rotational line.     

Wasser, Abwasser

Ohne Zusammenfassung     

Gammaspektrum nach Neutroneneinfang in Eu152(12,4a) und Niveauschema von Eu153

Using a source of Eu ₂ ¹⁵¹ O₃ the (n, γ) spectrum of Eu¹⁵² and Eu¹⁵³ was investigated by means of the Risø bent crystal spectrometer. A total of 57 transitions were fitted into a level scheme of Eu¹⁵³. The rotational bands of the Nilsson states 5/2⁺ [413], 5/2^? [532], and 3/2⁺ [411] were found up to the spin values 15/2, 13/2, and 11/2 respectively. The 13/2 member of the 3/2⁺ [411] band is suggested at 716.15 keV. The interpretation of these levels is confirmed by the comparison of the experimental branching ratios with theoretical predictions and by considerations concerning the spin dependent population of these levels.