摘要:

The ion chemistry of the E and F layers depends on a few ion-neutral reactions, with NO+as the terminating ion, and on dissociative recombination. In the topside ionosphere the main source and sink of the H+ions is the reversible charge transfer process H+ O+⇆ H++ O; the He+ions are formed by the action of solar radiation and are neutralized in dissociative charge transfer collisions with nitrogen molecules. The metallic positive ions present in sporadic E and in the D region result from photoionization and charge transfer. It is not certain how they recombine. Positive ions in the middle and lower part of the D region take part in a sequence leeding to the hydrated protons H3O+(H2O)nobserved. Negative ions are here important but little can be said with asurance about their nature.

ISSN:0010-7514    

DOI:10.1080/00107517008204819

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

The solidifled inert gases provide a valuable tool for the development of the molecular theory of solids because they approximate to simple theoretical models, in which spherically symmetric molecules are bound in close-packed lattices by short-range, central, van der Wads forces. Experimental investigations have been hampered until recently by the difficulty of producing defect-free single crystal specimens. Now that appropriate techniques have been developed, however, the prospects are good that there will soon be experimental evidence to clarify the extent to which simple two-body potentials may be used to represent accurately the forces in molecular crystals: and to answer related questions concerned, for example, with the contribution of three-body effects. Recent optical experiments suggest that the study of defect and impurity-induced properties in these solids may also prove to be very rewarding, and there are prospects of a condensed inert gas laser. There is considerable theoretical and experimental work still to be completed, however, before these ‘ideal’ solids may be regarded as being fully understood.

ISSN:0010-7514    

DOI:10.1080/00107517008204820

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

The new technology of fluidics uses fluids to perform control functions. Streams of fluids are used to sense, compute, amplify and control. This paper describes the construction and behaviour of some of the elements used and gives a few examples of applications which have been made.

ISSN:0010-7514    

DOI:10.1080/00107517008204821

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

When energetic heavy ions such as fission fragments pass through some solids, linear trails of damage (tracks) mark their trajectories. This paper reviews the large number of experimental observations of track structure in solids and shows how the track-storing ability of a solid is related to the electronic excitation of the bombarding ion and to a number of physical properties of the solid. Two models, ‘The Electron Thermal Spike’ and ‘The Ion Explosion Spike’, proposed to account for track formation are considered in the light of these results. The final section reviews a number of practical applications of the track-forming process.

ISSN:0010-7514    

DOI:10.1080/00107517008204822

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

A review has been made of the theories of the origin of x-ray satellite lines; the theories proposed since 1969 are dealt with in some detail. It seems certain that satellites are due to transitions in atoms which have an anomalous configuration of orbital electrons or are multiply ionized. The method of production of these configurations is the subject of all the theories. Recent results indicate that anomalous configurations and multiply ionized states can arise following a normal single ionization process.

ISSN:0010-7514    

DOI:10.1080/00107517008204823

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

In recent years The Institute of Physics and The Physical Society has given very valuable support to the organization of large international conferences on several branches of physics: e.g. it did so in the case of the International Conference on Magnetism held in Nottingham in September 1964, when nearly 600 participants attended; the papers a t this Conference were duly refereed and published as a large bound volume in association withThe Proceedings of the Physical Society. Now, it is not always desirable or expedient to hold such large conferences more than about once in every three years. Nevertheless, there are certain specialized fields of research in magnetism—as indeed there are in many other branches of physics—where the rate of advance of knowledge is such that i t is well worth while to organize smaller conferences with lesser numbers of participants but with a global distribution of the latter. To this need the I.P.P.S. has responded, and the Conference Booklet No. 1 contains the proceedings of the International Conference on High Magnetic Fields and their Applications, organized jointly by its Solid-state Physics Sub-Committee and its Magnetism Group, under the chairmanship of Professor N. Kurti, for 120 participants a t Nottingham, from 17th to 19th September 1969, with the valued support of the International Union of Pure and Applied Physics.

ISSN:0010-7514    

DOI:10.1080/00107517008204824

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

Electronic and Vibrational Spectra of Molecules. Edited by V. Skobel'tsyn. (Consultants Bureau (Plenum Press), 1968.) [Pp. vii+217.] $22.50. Scope: Library. Level: Specialist/postgraduate.

ISSN:0010-7514    

DOI:10.1080/00107517008204825

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

ISSN:0010-7514    

DOI:10.1080/00107517008204826

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor