摘要:

A quantum-mechanical theory for the Faraday effect in polyatomic molecules is developed along the lines of the general theory on natural optical rotation presented by Rosenfeld, Condon,et al.

ISSN:0026-8976    

DOI:10.1080/00268976200100641

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor

摘要:

The electron spin resonance spectrum of the radical NH(SO3-trapped in a single crystal of potassium sulphamate is interpreted. The hyperfine couplings for the hydrogen and nitrogen nuclei are given. The radical is planar, the unpaired electron occupying an orbital of π symmetry being predominantly a nitrogen 2p orbital.

ISSN:0026-8976    

DOI:10.1080/00268976200100651

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor

摘要:

An interpretation is given of the dependence on the rotational quantum numberJof the pressure shift and broadening of the lines of the vibration-rotation band of a hydracide molecule perturbed by a noble gas. It is shown that, with the fundamental hypothesis of adiabatic collisions between the absorbing molecule and the noble gas atoms, the impact theory can describe theJdependence. This results from the fact that one introduces the average over the sine of the phase shift η, which isJdependent, and not the average of the phase shift itself which is vanishing. With a hard-sphere model good agreement is obtained between the calculated and the observed shifts. Further, a rough estimation of the breadth is made.

ISSN:0026-8976    

DOI:10.1080/00268976200100661

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor

摘要:

Examination of irradiated potassium bicarbonate shows the crystal to contain trapped CO3-radicals, as well as CO2(H) radicals, and examination of irradiated urea nitrate shows this crystal to hold trapped NO3radicals.

ISSN:0026-8976    

DOI:10.1080/00268976200100671

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor

摘要:

The factor group splitting ofB1ubands of anthracene crystals is studied using the mixed crystal technique. Mixed crystals of anthracene and anthracene-D10have been analysed, in order to find experimental evidence for the doublet structure of the bands at 737–727 cm-1and 475–465 cm-1.

ISSN:0026-8976    

DOI:10.1080/00268976200100681

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor

摘要:

The results obtained in a previous paper [1] for an unsymmetric regular model are applied to solid hydrogen at low temperatures when the lattice structure and the quadrupole-quadrupole interaction make the interaction energies non-isotropic. It is shown that, as for the lattice structures with isotropic interactions, no second-order transition is likely to occur through a cooperative rotational effect. The possible occurrence of spatial ordering on sub-lattices is discussed. It is found that such ordering is unlikely to occur at low temperatures on the face-centred cubic lattice, but that on the hexagonal close-packed lattice (which is the probable crystal structure) there is a second-order transition to an ordered state. Using a zeroth-order approximation the temperature at which this transition occurs in pure ortho-hydrogen is found to be 5·8°k.

ISSN:0026-8976    

DOI:10.1080/00268976200100691

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor

摘要:

Previous interpretations of the electron spin resonance spectrum of Wurster's Blue cation are shown to be incorrect. In particular the nitrogen hyperfine splitting constant previously quoted as 0·28 gauss is, in fact, 7·0 gauss. A complete analysis of the spectrum is described.

ISSN:0026-8976    

DOI:10.1080/00268976200100701

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor

摘要:

Pullman applied London's method of calculating diamagnetic susceptibilities to some cata-condensed aromatic hydrocarbons with 4vcarbon atoms. He found that the magnetic properties of these compounds should be quite different from the magnetic properties of cata-condensed aromatic hydrocarbons with (4v+ 2) carbon atoms. The existing experimental data seem to confirm these predictions, at least qualitatively. Pauling's ring current model is of very limited use, when applied to 4v-systems. A simplified LCAO-MO treatment outlined here enables one to understand these results more readily. A cyclic chain of 4vsp2-hybridized carbon atoms is first subjected to a homogeneous magnetic field perpendicular to the molecular plane. Appropriate cross-links are then ‘formed’ and treated as a perturbation. A formula is given from which the diamagnetic anisotropy is easily estimated.

ISSN:0026-8976    

DOI:10.1080/00268976200100711

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor

摘要:

The interaction energy between two atoms is calculated including radiative corrections. It is shown that the interaction energy can be expressed in terms of the frequency-dependent polarizability and this leads to some simple approximate methods for the calculation of this energy. Magnetic dipole terms are also included and these terms are found to give a difference in the dispersion energy between two optically active molecules depending on whether they have identical or mirror image configurations. They may also be important for molecules with low-lying magnetic excited states.

ISSN:0026-8976    

DOI:10.1080/00268976200100721

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor

ISSN:0026-8976    

DOI:10.1080/00268976200100731

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor