Abstract
A method for measuring diffusion of a plasma produced from a metal of low vapour pressure with the aid of microchemical analysis is presented. A pinholed cavity of a suitable material can be used as a perfect sink of such a plasma stream. The trace amounts of the plasma deposited in the cavity are determined by flame photometry, the sensitivity of which is exceedingly high for alkali metals. An example is shown of the application of this method to the electric drift motion of a laser-produced lithium plasma in a uniform magnetic field. The number of lithium atoms colliding with the wall of a vacuum chamber, determined by flame photometry, shows a fairly good agreement with the density of plasma obtained by a double probe.
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