Abstract
Vacuum pumps which rely on oil to effect pumping, lubrication or sealing can cause severe contamination of pumped systems when, in molecular flow or at low gas throughouts, back-migration of oil occurs. The technique of gas-phase fluorescence spectroscopy conceptually offers a new method to give a measure of the identity and molecular density for a number of commonly-used vacuum fluids. To assess feasibility, a systematic study has been undertaken of the uv-visible absorption and fluorescence of a range of industrial pump oils, using both pure liquids and dilute solutions. From the quantum yield and molar absorptivities, the detection limit of vapour-phase fluorescence using photon counting has been estimated. The practicality of using this technique is discussed.
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