PLURAL BORE TO SINGLE BORE ION TRANSFER TUBE

摘要

An ion source includes an ion transfer tube having two segments for trans porting a sample fluid containing ions between a first chamber and a second chamber maintained at a reduced pressure relative to the first chamber. A fi rst segment may include a plurality of channels and heat conductive walls fo rming the plurality of channels. The plurality of channels and walls forming the channels promote efficient convective heat transfer to the sample fluid , thereby enabling operation at relatively high sample fluid flow rates, res ulting in an increase in the number of ions that may be delivered to a mass analyzer. A second segment forms a single common channel that receives a plu rality of sample streams and enables them to combine into a single ion strea m that may be introduced as a single gas stream expansion into the second ch amber.