Electronic absorption spectrum of cobalt antipyrine complex

The electronic absorption spectrum of cobalt antipyrine complex in the form of a single crystal is studied both at laboratory and liquid nitrogen temperatures. The spectrum is characteristic of Co²⁺ ion in an octahedral crystal field with bands exhibiting spin-orbit splittings at liquid nitrogen temperature. A good fit is obtained with the following crystal field parameters. B = 0.85 kK, C = 37.00 kK, Dq = 0.84 kK, ζ = 0.50 kK.     

Comments on some recent phenomenological potentials for the alkali halide crystals

Some comments are presented on three phenomenological potentials for the alkali halide crystals proposed in recent years by Narayan and Ramaseshan, by Woodcock, and by Romano, Margheritis and Sinistri. In the context a brief comment is made on the van der Waals coefficients reported by Hajj.     

Analysis of clinical events: the case of two dependent observations

In the analysis of clinical events associated with time, one often encounters dependent observations. The status of a patient at two different points of time during the course of treatment is one such example. In this paper, an appropriate model is assumed for the two random variables and a procedure is developed to answer the question: Do the two values, when compared, reflect a change in the patient?     

Computer-simulated ESR spectra of irradiated poly(olefin oxides)—effect of glass transition temperature on the ESR spectra

Investigations on the effects of γ irradiation on poly(methylene oxide) (POM) and poly(ethylene oxide) (PEO) have been made employing electron spin resonance (ESR) spectroscopy. The ESR sextet and doublet spectra, recorded for POM and PEO, respectively, on irradition in air at room temperature are broadened as the temperature is lowered and show a reversible change in line shape with temperature. The spectra are analyzed by computer simulation, employing Lorentzian line-shape functions and the least-squares method of total curve fitting. The component spectra are evaluated and are assigned. Superposition of the component quartet, triplet, and doublet spectra, corresponding to the radicals ?H₃, ?H₂O , and O?HO , respectively, together with a singlet due to the radicals ?CH₂ is considered to be the best fit to the observed spectrum for POM. The doublet spectrum recorded for PEO has been assigned to the radicals ?HO . The reversible broadening of the spectra has been associated with the mechanism of molecular motions around the glass transition temperatures of these polymers.     

Carbon phosphide (B2 Σ + — A2 Π i) band system: RKR Franck-Condon factors andr-centroids

Franck-Condon factors andr-centroids based on Rydberg-Klein-Rees potential have been computed for the CP (B ² Σ ⁺ —A ² Π _i) band system. These results are compared with the Morse values and discussed.     

Representation of the interevent intervals between a set of nonuniformly distributed “points” or “events”*

The general problem treated in this paper is the derivation of the distribution of intervals between neighboring points or “events” on a line. For the case in which the events are independently and uniformly distributed the distribution of intervals is well known. However, from the applications point of view, the nonuniform case is highly important, a situation motivating the derivation of the results in this paper.     

Momentum transfer analysis in Lennard-Jones fluids

The transfer of momentum of a test particle to its neighbours is investigated in Lennard-Jones fluids by computer experiments at different densities.