Abstract
A multistage photoionization chamber with different electrode distances has been devised to measure absolute photon fluxes in the vacuum ultraviolet, and was proved useful especially in short wavelengths. The device consists of a four-stage electrode in which the average traveling distance of electrons is increased in steps towards the end of the chamber. By finding the plateaus, the ratio of the ton currents for any two successive stages can be used as a measure of the correct operation of the chamber. Even under the conditions where secondary ionization occurs, the absolute photon flux can be determined by extrapolating the ion current to the distance at which the secondary ionization vanishes. Hence, this method makes possible a direct estimate of the absolute photon flux by a single experimental run regardless of secondary ionization. Examples are given at 584Å.
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