摘要:

After describing the discovery and early history of the Hall effect and the part it played in the development of theories of electronic conduction, the application of the Hall effect to semiconductor research is discussed. Experimental techniques for measuring the Hall coefficient and the procedures for interpreting the results are both described. Finally, it is shown that the Hall effect provides a useful tool for memuring magnetic flux density and for a number of other applications where other electronic devices are less suitable.

ISSN:0010-7514    

DOI:10.1080/00107517508211090

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

The underlying theory and the basic instrumental techniques of Mossbauer spectroscopy are described briefly. Applicationa of the technique in nuclear physics, lattice dynamics, radiation and ion-implantation studies, surface studies, metallurgy, chemistry, and biology are considered and evaluated.

ISSN:0010-7514    

DOI:10.1080/00107517508211091

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

The rate and mechanism of chemical change has been studied for many years but until recently experimental work has been concerned with bulk systemv so that the microscopic level of action was manifest only in some average way. In contrast, methods such as X-ray scattering yield direct information on molecular structure. The technique of molecular beam scattering is now a similar tool, capable of probing the dynamics of chemical reaction at the molecular level and leading to an understanding of the process in terms of the trajectories of the atoms participating. Discussion of the reaction is thus naturally in quantum channel cross-section terms; a ohange in emphasis, from conditions in the bulk sample to the collision proper, which has stimulated theoretical work. In particular, concepts and techniques developed for use in the atomic and nuclear collision field have been extended into this area. These rather rigorous calculations will be limited to the very simplest systems but, nevertheless, will form an important proving ground for more approximate models.

ISSN:0010-7514    

DOI:10.1080/00107517508211092

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

‘Deep inelastic’ collisions of neutrinos and antineutrinos with nucleons behave as if the nucleon Was composed of pointlike constituents (partons and antipartons). Neutrino experiments can measure the net number of (partons-antipartons), their angular momentum and mean square charge; they are 3 in number, have spin 9 and possess the fractional charges postulated ten years ago for the fundamental quarks, by Gell-Mann and Zweig. However, the observation of neutral as well as charged currents in neutrino reactions has compelled introduction of further quantum numbers; for example, a fourth quark with ‘charm’. Recent electron-positron collision experiments also suggest new degrees of freedom—‘charm’ and/or ‘colour’. The effects of these and other modifications to the quark model on neutrino cross-sections are discussed.

ISSN:0010-7514    

DOI:10.1080/00107517508211093

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

ISSN:0010-7514    

DOI:10.1080/00107517508211094

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

ISSN:0010-7514    

DOI:10.1080/00107517508211095

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

ISSN:0010-7514    

DOI:10.1080/00107517508211096

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Fields and Particles. By F. Briter and H. A. Medicus. (Elsevier, 1973.) [Pp. xiii + 688.] D.Fl. 52.00 ($18.90). Scope: Textbook.Level:Undergraduate.

ISSN:0010-7514    

DOI:10.1080/00107517508211097

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

ISSN:0010-7514    

DOI:10.1080/00107517508211098

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor