Abstract
Experiments on sparking potentials in hydrogen at low pressures (10-100 mmHg) have shown that the sparking potential is not just a function of the product of gas pressure and sparking distance (Paschen's law), but decreases as the gas pressure is decreased. Values of the generalized secondary coefficient deduced from these results therefore show a pressure dependence which is approximately linear. The loss of excited molecules by collisions of the second kind proposed by Davies, Dutton and Llewellyn Jones seems inadequate to account quantitatively for these results. The loss of excited molecules by collision with the anode is suggested as an additional mechanism.
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