An Introduction to Gas Discharges by A. M. Howatson (Auth.) PDF

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By A. M. Howatson (Auth.)

ISBN-10: 0080205747

ISBN-13: 9780080205748

ISBN-10: 0080205755

ISBN-13: 9780080205755

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The Diffusion Process Consider the concentration n of a simple gas in a container to vary, for any reason, in the x-direction only at some instant; there is then a net transfer of particles across any plane normal to x. It is to be expected that the net number of particles crossing unit area of such a plane per second is proportional to the on concentration gradient — ; the constant of proportionality is ox called the diffusion coefficient D for particles in their own gas, or the coefficient of self-diffusion.

Basic Processes of Gaseous Electronics. California, 1955. ENGEL, A. VON. Ionized Gases. Clarendon Press, Oxford, 1965. FLÜGGE, S. ). Handbuch der Physik, 21. Springer, Heidelberg, 1956. MASSEY, H. S. , BURHOP, E. H. S. and GILBODY, H. B. Electronic Ionic Impact Phenomena. ). 1. THE TOWNSEND DISCHARGE ANY sample of gas under normal conditions can be expected to contain a number of ions and electrons. At ground level the atmosphere contains an average in the order of 1000 positive and negative ions per cm 3 due to ultraviolet and cosmic radiation and radioactivity.

In chemi-ionization, which occurs in flames, the energy is provided by chemical exchange. It may never be assumed that when ionization occurs there are particles with sufficient energy to ionize another in a single collision, for cumulative ionization is possible, where several successive collisions give sufficient energy, through various stages of excitation, finally to ionize an atom. 4). Auto-ionization is the name given to a process involving a doubly-excited atom; that is, an atom in which successive collisions have transferred two valency electrons to higher levels.

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An Introduction to Gas Discharges by A. M. Howatson (Auth.)


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