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By the use of holographic storage techniques, the conductivity of iron doped lithium niobate has been investigated. The results indicate that the conductivity of the material immediately after hologram formation is much greater than previously suspected. This increased conductivity is shown to be a direct result of the multivalent properties of the iron dopant molecules, and the underlying theory necessary to account for the effect is presented, this theory being an elaboration of the bulk photovoltaic theory of von der Linde and Glass.

Muon-containing defects in insulators and in semiconductors have been studied for several years using the muon spin rotation ((mu)SR) technique. Double electron muon resonance (DEMUR) is an extension to the more common technique. This new double resonance technique can be used to observe EPR transitions of these muonic defects that are not directly observable in normal (mu)SR. This experimental technique has been applied successfully to muonium in quartz. A general theory of the response of two strongly coupled spin 1/2 particles to an intense rf magnetic field, when particularized to muonium in quartz, is found to describe the experimental results in detail.

A source of electron spin polarized He*(2('3)S) metastable atoms is described that provides a thermal energy beam with a flux up to 8 x 10('12) metastables/sec/sterad at a polarization P(,z) (TURN) 50%. The polarization is created by optical pumping and can be simply reversed or modulated without changing the beam trajectory or flux. The source is housed in a system of three differentially pumped vacuum chambers which allows the beam to be used for surface experiments in an ultra high vacuum environment. The polarization is measured with a Stern-Gerlach type analyzer which also serves as a useful diagnostic of beam composition and verifies the purity of the 2('3)S beam. The beam is demonstrated not to contain any significant admixture of 2('1)S metastables, ions, fast neutrals, or photons. Unless care is exercised, however, it is possible to produce a beam of energetic ground state helium which is of much greater intensity than the metastable beam. The conditions under which this occurs are described. A brief overview of metastable deexcitation spectroscopy (MDS) is given and a proposed first experiment involving the investigation of surface magnetism of Ni(110) and the necessary apparatus for this experiment are described.

A two-step matrix formulation is used to analyze the intermediate-coupling problem for an orbital doublet coupled to one doubly-degenerate vibrational mode (a Jahn-Teller doublet). First the linear-coupling problem is formulated in terms of a basis that reduces the effective Hamiltonian to blocks of tridiagonal matrices. The eigenfunctions for the lower states from this first step are then used as a new basis when including nonlinear-coupling and anharmonic terms. The energies are computed and the final eigenfunctions are used to compute reduction factors and polarizability matrix elements among many of the lower-energy states. Linear coupling, nonlinear coupling and anharmonicity are varied independently over a wide range. Even though these calculations are accurate (being equivalent to diagonalizing a matrix of order up to 16,000) and cover the intermediate-coupling region, there are no important deviations from theories using strong-coupling approximations for the lowest energy states which are important in experiment.