A pair of concentric capillaries as an interface for gas chromatography and supersonic jet/multiphoton ionization/mass spectrometry.

A pair of concentric capillaries was developed to mix helium, which was used as the carrier gas for gas chromatography, with argon for efficient molecular cooling by supersonic jet expansion. A simple instrument was constructed for the evaluation of nozzle diameter using the Hagen-Poiseuille equation. The effects of nozzle diameter, type of expansion gas… CONTINUE READING