Corso di matematica superiore by Vladimir Ivanovic Smirnov

By Vladimir Ivanovic Smirnov

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10). On closure, the voltage drops to zero, and the current grows exponentially, gradually reducing the contact pressure to zero. At this point, the contact resistance becomes very large, and melting of electrode material forms a liquid bridge between the electrodes moving apart. Finally the liquid bridge H+ Time ΓΊΓΊ rirs Time Time Fig. 10 Schematic diagram of the production of drawn arcs by the vacuum vibrator (Schuy and Franzen, 1964). (1) The contact is open. (2) The contact is closed, the current grows exponentially.

The Saha-Eggert equation was used in the form nr v ZT{T) h* ( ' ' {V where Z(T) are the partition functions, p is the electron pressure, T the electron temperature, m the electron mass, h Planck's constant, k Boltzmann's constant, and Ur the ionization potential. It should be noted here, that this kind of description of the experimental results is only heuristic, although the Saha-Eggert equation is used as a starting point. A superposition of temperatures has no physical meaning. 3 TECHNIQUE S OF IO N FORMATIO N USIN G ELECTRICA L DISCHARGE S In 1935, Dempster published an investigation on the aptitude of different vacuum discharge ion sources for solids mass spectrometry.

The relaxation time mainly depends on the tuning conditions and the coupling constant of the Tesla transformer. In most cases, breakdown occurs several rf periods after the last breakdown, but evidence was reported, too, for breakdowns once in every half-period (Hickam and Sweeney, 1964). The breakdown starts when the relaxing rf voltage exceeds the critical breakdown voltage for the gap. This breakdown voltage varies statistically from breakdown to breakdown due to changes of the electrode surface geometry.

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