When the sample is introduced to the gas chromatograph, the sample is vaporized and separated based on the interactions between the sample analytes and the coating of the chromatographic column. After separation, the analytes enter the mass spectrometer, which has two modes of operation. The first mode of operation only utilizes the time-of-flight mass spectrometer, which provides a high-resolution screen of all analytes within the chosen mass range. This mode is most useful for improved identification of unknown analytes when compared to low resolution GC/MS analysis. The second mode of operation utilizes both the quadrupole and the time-of-flight mass analyzers. All ions, aside from the ion of interest, are filtered out in the first quadrupole, then fragmented in the collision cell. After fragmentation the ions are then analyzed in the time-of-flight mass analyzer. This mode of operation provides high resolution data of both the parent and daughter ions allowing for more confident identification of the analyte. This mode of operation is ideal for more in-depth identification of analytes that may be difficult to identify using only a standard screen. Figure 1 gives a schematic of a typical GC/Q-TOF instrument.