Abstract
A hyperthermal surface ionization (HSI) interface is constructed for the coupling of liquid chromatography (LC) and mass spectrometry (MS). A liquid stream of 0.1-10 μL-min -1 is nebulized in a low molecular mass carrier gas of either hydrogen or helium. After expansion of the gas mixture into an expansion chamber, which is held at a background pressure of 0.5 Pa, a supersonic molecular beam is sampled with a skimmer into the vacuum of the mass spectrometer. Collision of the supersonic molecular beam with a platinum, tungsten, or rhenium surface leads to the formation of ions. These ions have been analyzed with a quadrupole analyzer
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