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Content material: Feasibility of polymer movie coatings via electroinitiated polymerization in aqueous medium / G. Mengoli -- Electroinitiated polymerization on electrodes / R.V. Subramanian -- Molecular points of a number of dielectric rest procedures in good polymers / G. Williams -- the character and alertness of electric phenomena in physics / H. Block

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We have already discussed how the current to cy­ lindrical or spherical collectors varies with the accelerating potential because of changes in sheath area or orbital effects. The resulting change in slope, although it occurs only when the collector is above the space potential, pro- 38 * Studies of Electric Discharges in Gases at Lozv Pressures duces a transition curve which may be hard to distinguish from that discussed in the foregoing paragraphs. With plane collectors, although orbital effects are absent, there are edge corrections (to be analyzed below) which produce a gradual approach to the horizontal portion of the curve.

23χ 2 1x 0 1110^ ^ · ΐ / /^" \/2e}m Ae A if γ S is expressed in amp. volt _1/2 . ) (48) In this case also the intercept of the straight line on the V axis occurs at a value V0 given by equation (42). In the following installment these equations will be applied to experimental data obtained with mercury vapor arcs. The positive ion sheaths around ne­ gative collectors are plainly visible in properly constructed apparatus and the thickness of the sheath can be measured accurately. These observed sheath thicknesses will be compared with those calculated by the space charge equa­ tions.

T h e mean free path λ, of 50 volt electrons, in argon at 347°K reduced to a pressure of 1 bar, is 69 cm. 9 4 j / 2 times the free path of argon atoms). Class II. Electrons Scattered through Small Angles by Elastic Collisions. — About 9 per cent of the collisions between 100 volt electrons and argon atoms are elastic in the sense that the electrons lose no energy. Over half of these col­ lisions, however, cause the electrons to be deflected through angles of less 1 The potential drop along the filament has been eliminated in many of the experiments by intermittent heating of the filament with a rotating commutator.

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Chemistry


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