An apparatus for separating and analyzing ions includes a detector (102), an ion drift tube (118) coupled to the detector and having a width (122), and a planar ion source (116). The planar ion source is coupled to the ion drift tube on an end of the ion drift tube opposite the detector and has a span (127) greater than or equal to the width of the ion drift tube to ionize an analyte gas and fragment the analyte gas ions prior to admittance to the ion drift tube. Chemical detectors and methods of chemical detection are also described.
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