摘要:

AbstractComparison of experimental results with the theory of the electrical resistivity of ferromagnetic rare earth alloys suggests a rapid redistribution of the scattered conduction electrons over the two spin orientations. In order to investigate whether this effect might be due to the Coulomb interaction between the conduction electrons, the mean free path for depolarization is calculated. In the Born approximation, the mean free path is of the order of some centimeters, whereas the mean free path for scattering is about 50 Å

ISSN:0370-1972    

DOI:10.1002/pssb.19670190139

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractA study is made of the experimental consequences of the theory of the vibrational spectra of molecular crystals presented recently in [3]. A discussion is also given of the model used in this theory. A detailed comparison is made between the theory and experimental results for pure and isotropic doped naphthalene crystals in the M‐band region. The theory accounts for the decay of electronic‐vibrational intra‐molecular excitations into pure electronic and intra‐molecular vibrational excitations by a resonance interaction. In this case the crystal spectrum should exhibit a wide absorption band corresponding to two‐particle excitation. If the reduction of the vibrational frequencies of the molecule accompanying its electronic excitation is comparable with the pure electronic excitation band width, the spectrum should also show a narrow band corresponding to a one‐particle excitation. These bands should be associated with the vibrational band which is observed experimentally. This idea is used to analysis the absorption in the first vibrational transition region of a naphthalene crystal. The one‐ and two‐particle excitation regions are identified and a quantitative analysis of the data is made which is in accordance with the theory. Collective effects, connected with the excitation decay, appear to be important in this transition region. In this connection of particular interest is an analysis of peculiarities of impurity vibrational absorption in isotopic solutions. Comparison between the spectral data naphtalene deutero‐isotopes and the theory also indicates the importance of some complicated collec

ISSN:0370-1972    

DOI:10.1002/pssb.19670190140

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractThe dependence of the ion‐electron emission coefficient on the angle of incidence is studied for targets of polycrystalline metals (Cu, Ag, Mo, Zr, W, Bi), and a graphite target, bombarded with 25 to 30 keV noble gas and nitrogen ions. The application of a magnetic field parallel to the axis of rotation shows that both the positive and negative ion currents to the collector are negligibly small. The emission coefficient increases as the angle of incidence increases up to angles of about 80 to 85°. Up to a certain limiting angle (from 36 to 81° for different ion‐target combinations) the angular dependence may be approximated by a reciprocal cosine law, while for larger angles the variation is rather slower. Comparisons are made, calculations based on the transparency

ISSN:0370-1972    

DOI:10.1002/pssb.19670190141

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractOn the basis of the diffusion equation for the motion of free charges, a monomolecular recombination probability is calculated for electron‐hole pairs. The calculation includes short‐time luminescence arising from recombination prior to the localization of the electronhole pair and extended luminescence due to recombination after localization. A qualitative discussion is given of the case in which a particular photon creates more than one electronhole p

ISSN:0370-1972    

DOI:10.1002/pssb.19670190142

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractA study is made of the effect of thermal lattice vibrations on the energy spectra of ions scattered by a Ni crystal. The intensities of the double‐scattering peaks are found to decrease with an increase in the target temperatur

ISSN:0370-1972    

DOI:10.1002/pssb.19670190143

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractA study is made of variations in photoresponse with strength of magnetic field in unbiased and reverse biased InAs p‐n junctions. This provides information on the combined effect of electric and magnetic fields, and illumination on p‐n junctions. The curves of photo‐electro‐magnetic e.m.f. against magnetic field strength for reverse biased p‐n junctions show linear inversion‐free regions. The results are analysed on the basis of the theory of the PEM effect in p

ISSN:0370-1972    

DOI:10.1002/pssb.19670190144

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractExperimental data for indium antimonide on the Hall‐mobility of electrons and the thermal e.m.f. in a weak magnetic field are compared with theory taking into account the non‐parabolicity of the conduction band. Formulae are deduced for the thermal e.m.f. and electron mobility for the case of a mixture of electron‐scattering mechanisms. It is then shown from the experimental data that, in doped indium antimonide crystals, mixed scattering does occur which involves impurity ions, and optical and acoustic ph

ISSN:0370-1972    

DOI:10.1002/pssb.19670190145

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractSingle crystals of KCl and NaCl are subjected to additive colouration treatment and X‐irradiation, and their hardening and softening observed. It is found that F‐centres and colloids have no appreciable effect on the mobility of dislocations. The assumption is made that certain defects are responsible for the hardening of irradiated NaCl crystals. These defects are due to soft irradiation and it is possible that they may be concerned with the generation of new vacancies during the irradiat

ISSN:0370-1972    

DOI:10.1002/pssb.19670190146

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

ISSN:0370-1972    

DOI:10.1002/pssb.19670190101

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY