Lattice effects in singlet ground state systems

We have investigated elastic, magnetic, thermal and structural properties of systems which exhibit induced magnetic behavior (TbP, PrSn₃, Pr₃Se₄, Pr₃Te₄). Particular emphasis is given to phonon effects due to the crystalline electric field, phase transitions, and magnetic fields. TbP has a first order magnetic phase transition and both TbP, PrSn₃ show a temperature dependence of the elastic constants, which can be explained with the known crystal field level scheme. The compounds Pr₃S₄, La₃S₄, Pr₃Se₄ exhibit structural instabilities at much higher temperatures than the magnetic or superconducting transition temperatures. Pr₃Te₄ does not exhibit a structural transition, but a strong elastic softening in a magnetic field. This effect is due to strong field dependent quadrupole transitions. All these systems are analyzed with respect to typical induced moment parameters.     

Electronegativity and crystal field splittings in rare earth compounds

Crystal field studies in a variety of 4f-and some 5f electron-systems reveal a correlation between crystal field splittings, i.e. sign and charge strength of simple ligands and their electronegativities. Deviations occur in several very dilute f.c.c. noble metals, as well as noble metal compounds presumably due to the d-electron contribution and perhaps ill-defined valence states, in particular in transition metal compounds.     

Optimization of spectral sensitivities of mosaic five-band camera for estimating chromophore densities from skin images including shading and surface reflections

Optical Review - In this paper, the spectral sensitivities of a mosaic five-band camera were optimized using a numerical skin phantom to perform the separation of chromophore densities, shading and...