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631.
Robens E. Krebs K.-F. Meyer K. Unger K. K. Dąbrowski A. 《Journal of Thermal Analysis and Calorimetry》2002,68(2):715-718
Short survey on the latest developments on standardisation and standard reference materials for particles, surfaces and pore
size analysis.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
632.
633.
On the basis of pseudopotential theory we obtain a simple expression for the interaction energy between ions in a metallic
system replacing the ion form factor in the direct (Coulomb) interaction by the pseudo-ion form factor of the indirect (conduction
mediated) interaction. This substitution can be justified for non-overlapping radially symmetric rigid ions. For the pseudo-ion
form factor (which includes ionic and orthogonalization effects) a model function is proposed and the model parameters are
determined for lithium, sodium, potassium, rubidium and aluminium by fitting to experimental phonon dispersion curves. Using
these form factors and an appropriate dielectric function we proceed to calculate binding energies. One finds that the values
obtained show a remarkable agreement with experimental results. This suggests that the proposed reduced expression for the
interaction energy and its numerical determination from experimental phonon curves is a good approximation method in evaluating
and understanding the binding energy of a metal. 相似文献
634.
Gerald Henkel Bernt Krebs Wilfried Schmidt 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》1992,104(10):1380-1382
635.
The reflectivity near the polarizing angle is being calculated both for slightly non-homogeneous dielectric films (possessing small gradients in the refractive index) and also for double layers having slightly different refractive indices. Thus discrepancies can be removed which may arise, when the refractive indices are determined from the Brewster angle, and it was also possible to work out a procedure which permits to analyse the structure of the various layers from experimentally obtained spectral reflectivity curves near the Brewster angle. 相似文献
636.
637.
Bernt Krebs 《无机化学与普通化学杂志》1970,378(3):263-272
Zirconium(IV) chloride crystallizes in the monoclinic space group P2/c with a = 6.361, b = 7.407, c = 6.256 Å β = 109.30°, Z = 2. The single crystal X-ray structure analysis shows the structure to consist of an arrangement of [ZrCl4/2Cl2] zig-zag chains. Within the chains each Zr atom has an octahedral environment; the octahedra are linked through sharing edges, the two terminal Cl ligands being mutually in cis-position. The structure is closely related to those of TcCl4, PtI4 and MoOCl3. The Zr? Cl bond lengths are 2.655 (bridge), 2.498 (bridge) and 2.307 Å (terminal) ZrBr4, HfCl4, and HfBr4 are isostructural with ZrCl4 相似文献
638.
639.
640.
T. Nagatomo K. Matsuta Y. Nakashima T. Sumikama M. Ogura K. Akutsu T. Iwakoshi H. Fujiwara T. Minamisono M. Fukuda M. Mihara T. Miyake K. Minamisono S. Momota Y. Nojiri A. Kitagawa M. Sasaki M. Torikoshi M. Kanazawa M. Suda M. Hirai S. Sato S. Y. Zhu J. Z. Zhu Y. J. Xu Y. N. Zheng J. R. Alonso G. F. Krebs T. M. Symons 《Hyperfine Interactions》2004,159(1-4):273-276
The momentum dependences of the nuclear spin polarization P and alignment A of 13B(, T
1/2 = 17.36 ms) produced in the 100A MeV 15N + Be collisions have been measured by detecting β-ray asymmetry. Because both the P and A were significantly smaller than the prediction from a simple kinematical model, some relaxation mechanisms must be take into
account. Comparing the signs of the observed alignment of 12B, the sign of the quadrupole coupling constant eqQ of 13B in TiO2 was determined to be positive. 相似文献