Patent ID: 8168942

Claim:
A chromatograph mass spectrometer having a chromatograph section in which sample components are separated in a temporal direction and a mass spectrometer section in which the sample components are sequentially subjected to a mass analysis, the mass spectrometer section being capable of selectively performing a scan measurement in which a mass-to-charge ratio is continuously and repeatedly scanned over a predetermined mass range, a selected ion monitoring (SIM) measurement in which the mass-to-charge ratio is switched from one value to another in a stepwise manner, with each value maintained for a specific period of time, or a simultaneous scan/SIM measurement in which the SIM measurement is performed in a course of the scan measurement, the chromatograph mass spectrometer comprising: a) a display controller showing a previously-created compound table on a screen of a display unit, the compound table including a list showing a kind of each compound, a normal retention time of each compound, and one or more mass-to-charge ratios characteristic of each compound; b) a selector for allowing an operator to select a compound that should undergo the simultaneous scan/SIM measurement, from the compound table displayed on the screen; and c) a measurement condition table creator producing a measurement condition table according to which the simultaneous scan/SIM measurement will be performed in a specified time range for each of one or more compounds selected by the selector and either the scan measurement or SIM measurement will be performed in other time ranges, the specified time range being defined for each of the selected compounds by setting a predetermined time span before and after the retention time of the compound, respectively.