摘要:

Recently Hutchison and Mangum have observed electron spin resonance in the lowest triplet state of naphthalene. An analysis of their results is given on the basis of spin-spin interaction between the two unpaired electrons. In addition to the lines observed by these authors another transition, which corresponds to Δm= ±2 in the atomic case, must occur at low field strength. This transition has been observed in a mixed crystal as well as in rigid glass solution.

ISSN:0026-8976    

DOI:10.1080/00268975900100301

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

This paper describes a series of detailed measurements on the electron resonance spectra of U.V. irradiated alcohol-hydrogen peroxide mixtures. The variation of the spectra with both time of irradiation and temperature is followed, and it is concluded that three different radical species are formed in the medium. A quantitative analysis of the growth and decay of these different species is then undertaken and it is shown that there is good agreement with a first-order kinetics of formation and decay.

ISSN:0026-8976    

DOI:10.1080/00268975900100311

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

The changes produced in the nuclear magnetic resonance spectrum of the ring protons of o-bromoaniline by the addition of acetone are found to be associated almost entirely with the decreased shielding of the proton ortho to the amino group. A series of spectra obtained with different amounts of acetone enables the spectral lines due to the individual protons to be identified and approximate values of the chemical shift and spin-spin coupling parameters to be deduced. These are used as a basis for a series of calculated spectra which progressively yield more accurate values of the parameters and finally a close agreement with the experimental spectrum. The dependence of the varying chemical shift upon acetone concentration is measured and discussed.

ISSN:0026-8976    

DOI:10.1080/00268975900100321

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

Chemical shifts and spin-lattice relaxation times have been measured for the thallium resonance in solutions of thallous salts containing ferricyanide ions, and citrate ions. The results provide strong evidence that the ion-pairs which are formed in these strong solutions are of a predominantly electrostatic character.

ISSN:0026-8976    

DOI:10.1080/00268975900100331

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

The infra-red spectra of the tris-acetylacetonates of chromium, managanese, iron and aluminium have been measured as far as 400 cm-1. The nature of the bands due to vibrations involving motion of the oxygen atoms relative to the metal is consistent with the operation of the Jahn-Teller mechanism in the manganic compound.

ISSN:0026-8976    

DOI:10.1080/00268975900100341

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

Using the semi-empirical LCAO molecular orbital method, the electronegativity parameter δ for nitrogen has been chosen to give reasonable fit between computed and ‘correct’ bond orders for a series of heterocyclic molecules. A δ-value of about 0·9–1·0 has been found for nitrogen in six-membered rings, and about 1·8–2·0 for pyrrole.

ISSN:0026-8976    

DOI:10.1080/00268975900100351

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

An attempt is made to establish a theorem of corresponding states for the viscosity and diffusion of pure liquids and solutions, based on Prigogine's theory of solutions. The agreement between theory and the little available experimental data is satisfactory.

ISSN:0026-8976    

DOI:10.1080/00268975900100361

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

The theory of the rate of approach to the steady state in themal diffusion is tested experimentally on the systems He-Ar, He-CO2, H2-CO2, and D2-CO2over a temperature range of about -78°c to 325°c. The course of the diffusion has been followed by means of the radioactive tracers37Ar and14CO2. The theory appears to be verified, and the results are used to calculate ordinary diffusion coefficients, which are in reasonable accord with previous measurements by other techniques. The thermal diffusion factors, which are obtained from the same measurements, also appear to have reasonable accuracy. The experimental method therefore appears to have promise as a sensitive method for the determination of forces between unlike molecules.

ISSN:0026-8976    

DOI:10.1080/00268975900100371

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

Theoretical calculations are made of the non-bonded repulsion energies between the halogen atoms in the hexa-halogeno-benzenes. The theoretical conclusions are compared with the available experimental evidence.

ISSN:0026-8976    

DOI:10.1080/00268975900100381

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

A theoretical analysis is made of the splittings induced in the levels7F1,7F2,7F3,7F4,7F5,7F6of the ion Eu3+by the electric field of the ethyl sulphate lattice. Four parameters are used to fit the data, and it is found that very good agreement can be established between experiment and theory in the great majority of cases. The parameters are compared to the corresponding ones for other rare earth ethyl sulphates. A reason is given for the absence of a magnetic dipole character in the transition5D1→7F1.

ISSN:0026-8976    

DOI:10.1080/00268975900100391

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor