Patent ID: 6772649
Filing Date: 2004-08-10
Classification: G01N,H01J

Abstract:
An arrangement for producing a directional and cooled gas jet in an ion source with a gas inlet or a UV/fluorescence detection cell with a gas inlet, comprising: a capillary extending into the interior of said ion source which is evacuated to generate a vacuum so that one end of said capillary is disposed in said vacuum, said one end being provided with a nozzle opening for discharging a gas sample into said ion source while being subjected to adiabatic cooling, the width of said nozzle opening being at most 40% of the inner diameter of said capillary, said capillary consisting of metal which is deactivated at the inner surface of said capillary by an inert coating and being provided with means for heating said capillary so as to prevent condensation of compounds from said sample in said nozzle.