We have observed experimentally the destabilization of both the Alfvén and the drift branches of the hydromagnetic, coupled drift-Alfvén wave in a steady-state, high-density ($n_0\approx {10}^{13}-{10}^{15}$ ${\mathrm{cm}}^{-3\mathrm{}}$) collisional plasma when an axial electron current is drawn along the magnetic field. The measured dispersion relation is in good agreement with solutions of our theoretical dispersion relation.

Volume compressions on the order of ${10}^2$ have been observed in glass microspheres heated by pulses from a Nd glass laser. The degree of compression is inferred from computer analysis of time-integrated x-ray photographs of the target plasma.

Two types of dispersion relations are experimentally shown to exist in an ion-beam-plasma system. For beam velocities close to the ion-sound speed, two normal modes, one unstable, are seen. For larger beam velocities, the interferometer output exhibits beating between the three predicted stable normal modes, which are the "fast" and "slow" ion-beam modes and the plasma ion-acoustic wave.

The nonlinear fate of lower-hybrid electrostatic turbulence triggered by a whistler "pump" wave is discussed. Rapid anomalous absorption of the electromagnetic energy and good ion and electron heating are obtained for very reasonable amplitudes of the pump wave.

We propose a new method for the study of the dielectric-relaxation phenomena called piezostimulated current, analogous to the one of thermally stimulated current. A dielectric is prepolarized and subjected to a very high hydrostatic pressure. The electric field is then removed and the depolarization current recorded as the pressure is lowered. The piezostimulated-current peak obtained for 6-polyamide enables one to calculate the following characteristics: activation volume $\Delta V$, activation enthalpy $\Delta H$, and activation energy $E$.

The energy and emission angle of electrons photoemitted from the (110) and (111) surfaces of W have been measured for photon energies between 7.7 and 10.7 eV. For prominent transitions, the component of internal $\overrightarrow{\mathrm{k}}$ vector tangential to the surface was obtained from angular measurements on each of the two surfaces. The two components of $\overrightarrow{\mathrm{k}}$ were used to determine the internal $\overrightarrow{\mathrm{k}}$ vector of prominent transitions occurring in the plane defined by the $〈110〉$ and $〈111〉$ axes.

Measurements of the specific heat of crystalline ${\left(\mathrm{SN}\right)}_x$ in the region 1.5-10°K are reported. A linear temperature contribution to the specific heat is found and interpreted as arising from an electron state density of 0.18 state/(eV spin molecule) and a one-dimensional tight-binding conduction band of width ≥0.9 eV. Analysis of the lattice specific-heat contribution supports existing evidence that ${\left(\mathrm{SN}\right)}_x$ is a highly anisotropic crystalline polymer and suggests a possible explanation for the apparent absence of a Peierls transition.

The ultraviolet photoelectron spectra of hydrogen adsorbed on W(100) have been studied as a function of the angle of emission. An analysis of this angular dependence at saturation coverage shows some indication of a two-dimensional band structure in the hydrogen-induced energy levels. We discuss the nature of the bands in terms of a molecular-orbital calculation of this adsorbed system.

Two very different types of angular distributions, one having a normal bell shape and the other being much more constant with angle were observed in the reaction ${}_{}{}^{144}{}_{}{}^{}\mathrm{Nd}$(${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{14}{}_{}{}^{}\mathrm{C}$) for two well-known $2^{+}$ states of ${}_{}{}^{142}{}_{}{}^{}\mathrm{Nd}$. The fits to these angular distributions using the distorted-wave Born approximation and/or coupled-channel Born approximation confirms the conclusion that the data give definite evidence for the importance of multistep processes. A comparison with the reaction ${}_{}{}^{144}{}_{}{}^{}\mathrm{Nd}(p, t)$ is also discussed.

The energy spectra and angular distributions of the yrast and statistical cascades in ${}_{}{}^{160,162}{}_{}{}^{}\mathrm{Yb}$ have been obtained from measurements of the reactions ${}_{}{}^{147,149}{}_{}{}^{}\mathrm{Sm}({}_{}{}^{16}{}_{}{}^{}\mathrm{O}, 3n)$ and ${}_{}{}^{148,150}{}_{}{}^{}\mathrm{Sm}({}_{}{}^{16}{}_{}{}^{}\mathrm{O}, 4n)$. An average of about six yrast and six statistical $\gamma$ rays occur in the $4n$ reaction. The data suggest that the yrast $\gamma$ rays are mostly stretched $E2\mathrm{}$.

We report direct observation of optically induced shifts of atomic energy levels in sodium vapor that occur in two-photon absorption. These shifts must be considered in high-resolution two-photon spectroscopy. Two cw dye laser beams of different frequencies and propagating in opposite directions are utilized to obtain high-resolution spectra. The intensity and frequency dependence of the level shifts are examined.

A peak at finite frequency has been observed in measurements of the order-parameter dynamical structure factor of short-mean-free-path superconducting aluminum films. The existence of a propagating, low-frequency order-parameter collective mode can be inferred from these results.

The mobility of electrons in silicon inversion layers and conductance activation energy have been measured as a function of substrate bias. The mobility increased and the activation energy decreased as the electrons were forced toward the surface. This seems inconsistent with activated conduction arising from potential fluctuations due to oxide charge.

X-ray inelastic scattering experiments performed on bare Li metal in a vacuum do not reveal any $L$-x-ray Raman band as has been previously reported. The Li results reported here are similar to those observed in other materials.

We report sharp optical absorption spectra, lacking evidence of carrier-pair creation process, for both like and unlike rare-gas atom pairs in alkali metals. The excited molecular orbital is probably a virtual bound state. These pair spectra also provide insight into optical properties of solid rare gases.

We present the results of electrical resistivity and optical absorption measurements for compositions spanning the metal-insulator transition in RbKr and CsXe alloys. The two transitions are similar and exhibit an apparently percolative character. No marked emergence of excitons accompanies the disappearance of conductivity. Spectral features associated with metallic conduction also persist through the transitions.

Low-field magnetization measurements on V-Fe alloys (28.5 and 29.5 at.% Fe) reveal a complex magnetic behavior of these alloys. However, the reversible part of the paramagnetic susceptibility indicates a well-defined ferromagnetic transition. Below the transition temperature, $T_c$, activation processes at very low fields cause the initial susceptibility to decrease rapidly as the temperature is lowered below $T_c$, thus explaining why the ac susceptibility displays a sharp peak at $T_c$.

Data for the exotic reaction ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$(${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{15}{}_{}{}^{}\mathrm{C}$)${}_{}{}^{49}{}_{}{}^{}\mathrm{Ti}$ are shown to be explained satisfactorily in the picture of successive transfer reactions, with a calculation which treats the finite-range effect exactly.

By experimental observation of the lowest $T=2\mathrm{}$ states in ${}_{}{}^8{}_{}{}^{}\mathrm{B}$ and ${}_{}{}^8{}_{}{}^{}\mathrm{Li}$, an isobaric quintet has been completed for the first time. The $T=2\mathrm{}$ state in ${}_{}{}^8{}_{}{}^{}\mathrm{B}$, populated via the reaction ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$(${}_{}{}^3{}_{}{}^{}\mathrm{He}$, ${}_{}{}^6{}_{}{}^{}\mathrm{He}$)${}_{}{}^8{}_{}{}^{}\mathrm{B}$, lies at 10.619±0.009 MeV excitation, and its analog in ${}_{}{}^8{}_{}{}^{}\mathrm{Li}$, found in ${}_{}{}^{10}{}_{}{}^{}\mathrm{Be}(p, {}_{}{}^3{}_{}{}^{}\mathrm{He}){}_{}{}^8{}_{}{}^{}\mathrm{Li}$, lies at 10.8222±0.0055 MeV. The excitation of the previously known $T=2\mathrm{}$ state in ${}_{}{}^8{}_{}{}^{}\mathrm{Be}$ was measured by ${}_{}{}^{10}{}_{}{}^{}\mathrm{Be}(p, t){}_{}{}^8{}_{}{}^{}\mathrm{Be}$ to be 27.4922±0.0027 MeV. A significant departure from the isobaric-multiplet mass equation is indicated.

Baryon-antibaryon bound states and resonances could account for the new particles, as well as narrow states near nucleon-antinucleon threshold, which were reported earlier.