ISSN:0370-1972    

DOI:10.1002/pssb.2221340150

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

ISSN:0370-1972    

DOI:10.1002/pssb.2221340151

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractResults of low energy electron diffraction calculations using the scattering matrix method are presented for the incident energy range 0.5 to 40 eV for the (111) A1 face and a comparison is made with reported measured total current spectroscopy results. It is concluded that the structure of the experimental spectra is determined by elastic diffraction effects and that the TCS technique provides information on the mean inner and absorption potentials in the very low incident energy region.

ISSN:0370-1972    

DOI:10.1002/pssb.2221340102

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractThe angular force model is used to investigate phonon density of states of a‐Si0.5Ge0.5by considering only the first nearest neighbour interactions. A force constant decrease of the order of only 5% is observed when the phase changes from crystalline to amorphous system. The relevance of the obtained results to the Raman spectra is discusse

ISSN:0370-1972    

DOI:10.1002/pssb.2221340103

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractBy means of a simple molecule‐theoretic model of “linear superposition of two‐electron molecules” the bond charges between nearest neighbours and the effective charges of ions are calculated for ternary zinc‐blende structure alloys as well as chalcopyrite semiconductors. Taking into account both, the charge transfer among the ions caused by the differences of electronegativities of atoms used and between the bonds created by the internal stress of the lattice a nearly unvaried averaged bond charge amount of the alloy is found, but rather dramatically changed local bond charge parameters in comparison with the respective values of binary compounds used. This fact should influence the noncentral force interaction in such semic

ISSN:0370-1972    

DOI:10.1002/pssb.2221340104

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

ISSN:0370-1972    

DOI:10.1002/pssb.2221340154

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

ISSN:0370-1972    

DOI:10.1002/pssb.2221340155

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

Abstract15N‐NMR measurements are performed to investigate the proton dynamics in the hydrogen bonds of type NH … Cl near the ferroelectric phase transition (Tc= 130 K) of tris‐sarcosine calcium chloride (TSCC), enriched with15N nuclei. In the ferroelectric phase the second moment and the shape of the15N‐NMR lines change significantly with decreasing temperature. The experimental data can be explained on the basis of a quantum, mechanical torsion oscillator model for the NH2group. This interpretation allows the definition of a local order parameter from the NMR spectra which changes with the temperature at T

ISSN:0370-1972    

DOI:10.1002/pssb.2221340105

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

ISSN:0370-1972    

DOI:10.1002/pssb.2221340156

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

ISSN:0370-1972    

DOI:10.1002/pssb.2221340157

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY