Darstellung und schwingungsspektren von [Me3TlCN]− und [(Me3Tl)2F]−

The preparation, some properties and the vibrational spectra of NMe₄ - [Me₃TlCN] (I) and NMe₄[(Me₃Tl)₂F] (II) are reported. A C_3v point-group can be assigned to the complex anion in (I), whereas in (II) a linear TlFTl-bridged system (symmetry D_3h) is present.     

Temperature dependence of the hyperfine fields for fluorine in ferromagnetic iron,nickel and gadolinium

The temperature dependence of the magnetic hyperfine fields at the sites of F nuclei implanted into ferromagnetic Fe, Ni and Gd has been studied in the temperature range from 77 K to 670 K. A pulsed proton beam was used to observe the time-differential precession of the 5/2⁺ state in¹⁹F. Deviations from the bulk magnetization were found for Fe and Ni. The damping of the two observed fields in Ni was interpreted in terms of a field distribution caused by an induced radiation damage. The occupation sites for F and possible mechanisms of the anomalous temperature dependence are discussed.     

Giant enhancement of the valence band photoemission intensity in γ-Ce

We have observed a giant enhancement of the Ce valence band emission above the 4d absorption threshold. It is interpreted as being due to autoionization decay following 4d¹⁰4f¹ → 4d⁹4f² transitions. By taking advantage of this effect we have been able to make a determination of the location of the 4f levels in γ-Ce.     

Electrical analogy of transient heat flow in laser rods

An analog circuit is presented for the determination of the transient thermal profile in optically pumped laser rods. The model can be used to simulate the behavior of solid and hollow cylindrical rods under single shot and repetition rate conditions. The design of a particular circuit is given as well as experimental results.     

Current dependence of gap enhancement by microwaves

On the basis of Eliashberg's theory for nonequilibrium superconductivity it is found that the enhancement of the energy gap by microwaves depends strongly on the current in the sample and that the temperature dependence of the critical quantities changes significantly under the influence of microwaves.