摘要:

Optical absorption studies have been carried out from the UV to NIR for Ho3+ions (0.1 M%) mixed organic acids namely anthrolinic, benzoic, salicylic and pthalic acids. Spectral intensities of various observed bands of Ho3+have neen affected very significantly depending upon the surrounding environment. We made a correlation between the intensity parameters and the spectral intensities quite clearly by the application of Judd-Ofelt theory. Of the various levels recorded, particularly the energy level5G6←5I8has shown a distinctive phenomenon in its intensity magnitudes as a function of the host. We have also examined the bonding nature of the complexes, as ionic for Ho3+in four different fluorescing organic acids.

ISSN:0031-9104    

DOI:10.1080/00319109108030635

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Two fundamental relationships describing natural phenomena are posited to be functions of the free space in which atoms and molecules are confined and interact. These relationships are the Boltzmann energy distribution principle and the equation of state. In both cases the free space is that space available to the centers of mass of the atoms and molecules as they move randomly in translational motion. The hard core volume of atoms and molecules is not available for translational motion of their centers of mass and is excluded from the volume function in both Boltzmann's principle and the equation of state. Only in this way is it possible: 1) to apply Boltzmann's principle to the distribution of atoms or molecules between the two energy states of two phases in equilibrium; solid-gas, liquid-gas or solid-liquid and 2) to apply the equation of state to the gas, liquid or solid phase in order to determine the internal pressure exerted by the translational motion of atoms or molecules and to deduce the internal tension in the cohesion between atoms or molecules. These relationships are applied to water for the determination of the molar free space and molar hard core volumes of pure water.

ISSN:0031-9104    

DOI:10.1080/00319109108030636

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The thermodynamic method of Eyring and Hirschfelder has been employed to evaluate intermolecular free lengthLfwhereas free length theory FLT of Jacobson was used to compute the theoretical data of ultrasonic sound velocityCFLT. A maximum variation of 0.06% is observed between experimental velocity and the velocity deduced from free length theory (Cexp>CFLT), while uncertainty forCexpdata is as high as ±0.02%. The ultrasonic velocity dataCFLTand densitypof pentanol in water have been used to compute coefficient of thermal expansion α, isothermal compressibility βT, ratio of heat capacity γ, internal pressurepiand pseudo-Gruneisen parameter Γ for the system. The results confirm that, upon increasing the temperature of the system, the solutions become easier to compress.

ISSN:0031-9104    

DOI:10.1080/00319109108030637

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The electrical conductivities of solutions of nickel chloride in ethylene glycol and glycerol have been measured at 25°C at concentrations within the range 0.001 to 0.5 mol dm−3. The results are consistent with the Debye-Hückel-Onsager theory at low concentrations, and values of the molar conductivity at infinite dilution have been obtained by extrapolation. Values for the ionic conductivity of the doubly charged nickel ion are deduced, for these solvents, using previously measured values for the chlorine ion, whence the ion mobilities of nickel in ethylene glycol and glycerol have been calculated. The results indicate that, as in aqueous solutions, this doubly charged ion has a lower mobility than singly charged ions of the same radius, but that the effect is more marked in ethylene glycol and even more so in glycerol.

ISSN:0031-9104    

DOI:10.1080/00319109108030638

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

An alternative theoretical formulation for determining oscillator strength using a non-spherical molecular cavity is developed and this model correlated with experimental measurements made using non-resonant scattering of a He-Ne laser beam incident upon select aqueous ionic concentrations of NaCl. The light beam was transmitted through each sample and measurements made, at room temperature, on the transmitted light to determine the shape factor. The shape factor was estimated to be 0.30 from the results of this experiment. The nature of the ion-solvent interaction was obtained from the dielectric decrement.

ISSN:0031-9104    

DOI:10.1080/00319109108030639

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

In order to supplement the literature data on VLE, isobaric bubble temperature data were collected for the system phenol-n-propanol over the entire composition range by indirect method using a standard Swietoslawski type ebulliometer. The measurements were made at 200, 400 and 710 mm Hg. The experimentalt—xdata were correlated with both equation of state method and gamma-phi methods. In the former approach the Soave equation of state is used wherfeas in the latter one Wilson, NRTL and UNIQUAC models are used.

ISSN:0031-9104    

DOI:10.1080/00319109108030640

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The Einstein oscillator model of the Wigner electron crystal takes a specified force constant, which is an explicit function of the electronic separationrs. Here a method is devised for its self-consistent calculation. For the gaussian density of the Wigner oscillator, with width λ in terms ofrs, experimental data on the melting temperatureTmversus Landau filling factorvis employed to plot the critical overlap parameter, λcsay, versusTm. This shows that λcincreases asTmdecreases, which is in contrast to Lindemann's Law.

ISSN:0031-9104    

DOI:10.1080/00319109108030641

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0031-9104    

DOI:10.1080/00319109108030634

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor