Light beam deflection using holographic scanning techniques.

Holographic techniques provide a mechanically simple method for deflecting light beams through two-and three-dimensional scan patterns. One technique for producing a two-dimensional raster scan through the use of a one-dimensional circular motion is described in detail. To illustrate the feasibility of such devices, a two-dimensional holographic scanner has been fabricated and used to construct a simple closed-circuit television system.

Surface-Layer Relaxation in the Dielectric Spectrum of CaF Doped With GdF.

CaF crystals doped with 0.1 percent GdF were observed to develop surface layers when annealed above 700 °C in air, during application of Pt paste electrodes. The conductivity in these surface layers was much higher than in the bulk, due presumably to the large numbers of anion vacancies produced by dissolved oxygen.

Viral plasmacytosis (Aleutian disease) of mink resembling human collagen disease.

A disease in mink has been discovered that has many of the features of collagen diseases in man. Affected animals suffer from wasting with leukopenia and thrombocytopenia as well as plasma cell infiltration, hypergammaglobulinemia, glomerulonephritis, arteritis and amyloidosis. Cell-free filtrates and ultracentrifugates from diseased animals induced the disease in normal mink, and aleutian genotypes were unusually susceptible to infection.

Electric Fields Produced in Cubic Crystals by Point Defects.

Charged point defects in crystals polarize the surrounding ions. These induced dipoles contribute to the electric field in the crystal. In this paper, lattice sums for the calculation of this contribution are given for the NaCl, CsCl, CaF, and ZnS structures.

Correlation of Successive Atomic Steps in Crystals by Relaxation Mode Analysis.

The relaxation mode analysis is used to compute the average value of the cosine of the angle between successive steps of an ion diffusing by a vacancy mechanism on a lattice. The technique is applicable to tracers (self-diffusion) or impurities, on any lattice. The result, given in terms of the eigenvalues and eigenvectors of a secular equation, is suitable for machine computation.

Relaxation Modes of Trapped Crystal Point Defects: the Three-Neighbor Shells Model in NaCl.

The results of a relaxation-mode analysis are presented for two cases of trapped-defect relaxation in the NaCl structure, in which both defects occupy the same type of site (e.g., impurity divalent ion and trapped vacancy), or in which they occupy the two different types of sites (vacancy pair).

Relaxation Modes for Trapped Crystal Point Defects.

Group representation theory is applied to the problem of calculating the relaxation modes of a point defect trapped near an impurity atom or other defect in a crystal, where more than one set of neighboring sites is available to the point defect. For illustration, the case of a cation vacancy trapped near a divalent impurity in the sodium chloride lattice is treated, including nearest- and next-nearest-neighbor sites.