Some regularities within the Stark widths and shifts of resonance ion lines from Li to Ca

A periodic dependence of the Stark widths and shifts of resonance lines, for singly- and doubly-ionized elements, has been found on nuclear charge number Z. These periodicities were found for Griem's theoretical values of the Stark parameters of resonance lines of some singly charged ions from Li to Ca; for other singly- and doubly- charged ions, this parameter was calculated from Griem's semiempirical formula. The dependence of the Stark parameters of the resonance lines on atomic polarizability X has been determined and used to estimate Stark widths and shifts for other singly-charged ions. These values are compared with estimates derived form Griem's semiempirical formula for the Gaunt factor g = 0.2.     

Baryon poles in proton decay amplitudes

The decay rate of the p→π⁰e⁺ mode is calculated in SU(5) grand unified theory using a pole model with proton and $\text{1}\text{2}{}^{\mathrm{?}}$ baryon poles. Baryon-to-vacuum amplitudes are calculated in the framework of the MIT bag model. It is found that the partial decay rate [～(5×10³¹ yr)^?)] is close to the partial decay rates calculated by different methods.     

The angular dependence of plasmon loss features in XPS spectra from polycrystalline aluminum: Clean surfaces and effects of oxygen adsorption

The angular dependence of relative intensities of bulk- and surface-plasmon loss peaks associated with X-ray photoemission from the Al 2p core level has been measured for aluminum samples under ultrahigh vacuum conditions. At near-grazing electron exit angles, a sixfold increase in the single-surface-plasmon relative intensity is observed, while the single-bulk-plasmon relative intensity is decreased by ～20%. These experimental results are compared with theoretical calculations based on a dispersionless-plasmon jellium model and including both extrinsic and intrinsic plasmon creation. The presence of intrinsic creation is suggested and theoretical relative intensities are in good agreement with, although generally somewhat higher than, corresponding experimental values. For specimens with low coverages of oxygen (～0.15 monolayer), only surface-plasmon loss features are found to be associated with the O 1s core level, indicating near-surface adsorption.     

Contamination of some important kinds of plants by fission products

Quantitative data for some of the radionuclides, most important because of their intensity and radiotoxicity, present in the biosphere after the Chernobyl accident are given for a selected number among numerous plant and food samples analyzed before and after the accident.     

The thermochemical behaviour of zeolite inclusion complexes

The thermochemical behaviour of nitrate inclusion complexes of zeolites of type A was investigated and DTA curves recorded. An attempt was made to identify thermal effects. Supplementary information was obtained from the IR spectra of the solid phase before and after heating as well as from the process of denitration of inclusion complexes.     

Synthesis,physicochemical properties and voltammetric characterization of some new Fe(III) complexes with semicarbazone-based ligands

Several bis(ligand) octahedral complexes of iron(III) with salicylaldehyde semi-, thiosemi-, and S-methylthiosemi- carbazones have been synthesized and characterized by elemental analysis, conductivity and magnetic measurements, electronic and IR spectra, as well as by linear sweep and cyclic voltammetry. General procedures for the syntheses of all types of complexes have been established, giving better defined reaction conditions. Physicochemical properties of the novel complexes have been related to those of the already known compounds of the same type.     

Tricritical point in inhomogeneous superconductors

We show that in large period modulated alloys the tricritical points curve begins at α_c = 1/(1 + δ, where δ is the modulation amplitude. In the domain of the 2nd order transition, which appears smaller than in the homogeneous case, H_c2¹(T) and H_c3¹(T) are calculated.     

Some investigations of the rotation conditions in spectrochemical d.c. arc light sources in horizontal graphite tubes

The process of plasma formation and rotation in a graphite tube in a magnetic field was observed by means of a high speed camera. Phenomena occurring in a transient period, before a state of steady rotation is reached, were recorded. Further, the mutual influence of two plasmas burning in the graphite tube under various conditions was studied.