Abstract

Two servo-controlled balances designed to measure forces exerted by molecular beams are described; usable sensitivities are of the order of 10−5 dynes. One balance is designed to measure accommodation coefficients on interchangeable targets, which may be heated up to 1000°C. The other, in conjunction with an ion-gauge, may be used to measure absolute molecular beam fluxes and mean incident energies in both single and binary mixed beams.

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