In an attempt to determine the intercepts of the $K^{*}$ ($1^{-}$) and $K^{**}$ ($2^{+}$) Regge trajectories from total cross-section data, it is found that significant deviations from SU(3) symmetry have to be considered. These deviations are accounted for by assuming that the Pomeranchuk-Regge residue has a small $I=0\mathrm{}$ octet component apart from the usual SU(3)-singlet term.

We have measured a sample of 2785 events of the reaction $\overline{p}+n\to 2{\pi }^{-}+{\pi }^{+}$ which are due to antiproton capture at rest in deuterium. An analysis of the ($I^G{J}^P=1^{-}{0}^{-}$) three-pion final state has been attempted in terms of the $\pi -\pi$ interaction.

Experiment and theory are presented to show that pulse excitation of cylindrical plasma produces decaying ringing at the electron-cyclotron frequency and at any upper hybrid frequency for which the electron-concentration gradient vanishes. In the absence of a dc magnetic field, the ringing occurs at the maximum plasma frequency.

Detailed and accurate measurements of the cyclotron effective masses for both $s$- and $d$-like carriers have been made in Pt. Comparison with recent augmented-plane-wave band-structure calculations indicate that the many-body mass enhancement factor is roughly isotropic with a value of about 1.5.

The Fermi surface for both the $s$- and $d$-like carriers in Pt has been determined by observation of the de Haas-van Alphen effect. The Fermi surface is in good agreement with recent augmented-plane-wave band-structure calculations.

The two-photon spectrum is calculated for absorption near the band gap in an alkali halide. By using just a two-band model, the theory correctly predicts the magnitude, frequency dependence, and polarization dependence of the absorption spectrum.

The diffraction of a light beam is used to study the propagation of transverse magnetoelastic waves generated in a bar of yttrium iron garnet by an rf magnetic field. For the first time, waves are observed on the lower as well as on the upper branch of the magnetoelastic dispersion curves.

The charge-transfer cross section for ${\mathrm{N}}_2^{+}$ + ${\mathrm{O}}_2$ → ${\mathrm{O}}_2^{+}$ + ${\mathrm{N}}_2$ has been measured by a drifttube technique in the formerly inacessible energy region from 0.05 to 1 eV in the center-of-mass system. In this energy region the charge-transfer cross section $\sigma$ may roughly be represented by $\sigma =2.2\mathrm{}$ ${\mathrm{\AA }}^2$/${\mathrm{}(\mathrm{c}.\mathrm{m}.\mathrm{energy}\mathrm{in}\mathrm{eV})\mathrm{}}^{\mathrm{½}}$. This expression is consistent with a model dominated by the induced dipole interaction, and it connects smoothly thermal-energy measurements to ion-beam measurements at several eV.