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Showing papers in "Physics Letters A in 1970"


Journal ArticleDOI
Rod Boswell1
TL;DR: In this paper, a standing helicon wave has been excited by applying a transverse rf field to a cylindrical plasma immersed in a steady axial magnetic field, and the predictions of the hydrodynamic theory are found to be inadequate in describing the damping.

282 citations


Journal ArticleDOI
TL;DR: In this article, the negative and neutral charge states of the zinc vacancy were identified as the positive and negative charge states, respectively, of the ZnO vacancy, in anisotropic ESR spectra corresponding to spin 1 2 and a spin 1 hole centers.

184 citations


Journal ArticleDOI
TL;DR: In this paper, the ESR spectrum of ZnO with 2 MeV electrons is identified as an F + center and a correlation between this center and the radiation induced optical absorption has been observed.

169 citations


Journal ArticleDOI
TL;DR: In this paper, the anniliation lineshape is used to measure the percentage of positrons trapped by dislocations, and the sample hardness is a linear function of the logarithm of the deformation.

118 citations


Journal ArticleDOI
TL;DR: The theory of translational and orientational melting with application to liquid crystals is presented in this article in a manner analogous to that of Kirkwood and Monroe, and the theory is applied to liquid crystal crystallography.

106 citations


Journal ArticleDOI
TL;DR: In this article, new invariants, coherent states and transition amplitudes are constructed for non-stationary forced oscillators, and the Franck-Condon factor is calculated.

103 citations


Journal ArticleDOI
TL;DR: Pulsed field measurements of the upper critical fields at 4.2°K, H c2 (4.2ºK), in Nb 1− y (Al 1− x Ge x ) y and Nb 3 Al are approximately 410 kG and 295 kG respectively as discussed by the authors.

101 citations


Journal ArticleDOI
TL;DR: A strong peak has been observed in the energy spectrum of forward scattered secondary electrons as discussed by the authors, interpreted as an effect of charge exchange into a continuum state, a special case of ionisation.

77 citations


Journal ArticleDOI
D.R. Tilley1
TL;DR: In this paper, superconducting weak links in series can interact with a cavity mode so that the d.c. voltage is the same across each link, and the photon number is proportional to M 2.

72 citations


Journal ArticleDOI
TL;DR: In this paper, the Lamb dip was used to circumvent Doppler broadening, which allowed microwave measurement of rotational lines in the 1-3-mm wave region to accuracies of 1 part in 108.

72 citations


Journal ArticleDOI
H.J. Doucet1
TL;DR: In this article, a negative ion density of 10 10 cm -3 was obtained by introducing iodine in a gas discharge where electrons are trapped in a potential well, and the proportion of electron was found to be only a few parts per thousand.

Journal ArticleDOI
TL;DR: In this paper, the angular intensity variation of elastically scattered electrons expelled from various shells in a NaCl crystal by MgKα radiation was reported, and the results were extended to the case of NaCl crystals.

Journal ArticleDOI
TL;DR: In this paper, it was shown that vortex rings with constant circulation can be described by an energy such that the velocity and impulse of the rings are connected by the usual relation v = ∂E/∂p.

Journal ArticleDOI
TL;DR: In this paper, p-polarized light incident non-normally on thin Ag films has been observed above the bulk plasma frequency, which is interpreted as being due to excitation of longitudinal plasmons in accordance with recent theoretical predictions.

Journal ArticleDOI
G. Küppers1
TL;DR: In this paper, the stability of convective flow in a rotating fluid layer for rigid boundary conditions is investigated and the critical Taylor number above which the only stable two-dimensional flow becomes unstable is calculated as a function of the Prandtl number.

Journal ArticleDOI
TL;DR: In this article, new possible analogs of the TlSe-type binary semiconductor compounds (with a shifted coordination of metallic atoms) following the principle of rational substitution are presented.

Journal ArticleDOI
S. Misawa1
TL;DR: In this paper, the temperature dependence of the susceptibility of a Fermi liquid is shown to be of the form a - bT 2 In T, and hence in the presence of a magnetic field the heat capacity varies as T In T at sufficiently low temperatures.

Journal ArticleDOI
TL;DR: In this paper, an abrupt change in density and edge energy is produced in amorphous Ge films by varying growth temperature, and the edge density is close to the crystalline density.

Journal ArticleDOI
TL;DR: In this paper, it was shown that the shakeoff theory holds for both photon and electron excitation in the K-Auger spectrum of neon and relative intensities were given for diagram and satellite lines of the spectrum.

Journal ArticleDOI
TL;DR: In this article, the semantic confusion surrounding the word superradiance is discussed, and by use of a simple criterion for the critical inversion the case of a "mirrorless laser" is shown not to be super-radiance in Dicke's meaning of the word.

Journal ArticleDOI
TL;DR: In this article, a central penetration maximum of width (0.7 ± 0.1) was achieved for 5, 10 and 15 MeV electrons along 〈100〉 in 10 μm MgO in agreement with the ψ1 Lindhard angles for the bound motion.

Journal ArticleDOI
TL;DR: In this article, the Langevin equations governing the thermal voltage across a Josephson junction just below the transition temperature and driven from a constant current source were solved on a computer using a molecular dynamics method.

Journal ArticleDOI
D. Herlach1, F. Heinrich1
TL;DR: The angular distribution of photons from positrons annihilating in KCl is compared with that of additively colored KCl as mentioned in this paper, suggesting that a large fraction of positrons is trapped in F-centers.

Journal ArticleDOI
H. Kunz1
TL;DR: The locus of the zeros in the complex fugacity plane of the grand partition function for four classical lattice systems has been determined in this article, and the locus for the zero in a lattice system has also been determined.

Journal ArticleDOI
TL;DR: The influence of magnetic field on the narrow peaks in the 2γ angular distribution from e + annihilation in quartz was studied in this paper, and the resulting quenching and polarization effects were interpreted as evidence for positronium-like Bloch states.

Journal ArticleDOI
W. Legler1
TL;DR: In this paper, a theory which takes account of multiple scattering effects is proposed, which is in reasonable agreement with experiments of other authors, and it is shown that at high densities the drift velocity of low energy electrons fails to be a function of E / N only.

Journal ArticleDOI
TL;DR: In this article, a new four-pulse 6τ cycle was described, which promises to be more efficient at line narrowing than previous cycles of equal or lower rank, and is shown to have better line narrowing performance.

Journal ArticleDOI
Kyozi Kawasaki1
TL;DR: In this article, the velocity autocorrelation function has been studied using the mode-mode coupling theory of transport phenomena, and the result agrees with the molecular-dynamic calculations of Alder and Wainwright.

Journal ArticleDOI
TL;DR: In this paper, the thermopower terms [d ln A/D ln E]EF and [d Ln λ/d E] EF have been found from measurements of thermopowers of thin films, using new results for the noble metals and published data for the alkalis.

Journal ArticleDOI
TL;DR: In this paper, a general correlation between valence state and superconductivity in covalent compounds was deduced, and it was shown that PbNbS3 and PbTaS3 are superconducting below 2.62° and 3.07°K respectively.