FIELD: chemistry.
SUBSTANCE: invention relates to a process for the chemical analysis, wherein the ionized gas stream is fed ionized gas stream (24) to (28) filter mounted in the flow channel (18), filtered ionized gas stream using a method DMS/FAIMS, to remove at least some of the ions (25, 105) from a gas stream. Parallel mostly unionized gas stream (13) which is located on at least one side of the ionized gas stream is fed to the filter area with the ionized gas flow. Mentioned mostly unionized gas stream (13) form a flow channel (18).
EFFECT: signal enhancement and improved signal to noise ratio.
11 cl, 9 dwg
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