Mass spectrometric studies of material evolution from magnetic liquid seals
- 1 October 1980
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 51 (10) , 1370-1373
- https://doi.org/10.1063/1.1136067
Abstract
Evolution of ferrofluid contained in two vacuum rotary feedthroughs is studied for the first time by a time‐of‐flight mass spectrometer in order to provide information on the background material these seals introduce into a high vacuum system. The seals used diester and poly(phenyl ether) based ferrofluids. The rate of evolution of the diester was found to be of the order of 3×10−10 g/s and that of the poly(phenyl ether) was below the detection limit of the mass spectrometer, i.e., 10−10 g/s. The oxygen and water evolution, which are generally of prime interest in vacuum application, were found to be 10−9 g/s for both seals at 3,000 rpm. The feedthroughs were successfully employed in precision abrasion mass spectrometric experiments.Keywords
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