Gas chromatograph mass spectrometer

A gas chromatograph mass spectrometer comprising:

• a gas chromatograph part configured to generate sample gas from an injected sample and to separate components in the sample gas from each other by a separation column;
• a mass spectrometer part including an ionization part for ionizing the components flowing out from an outlet of the separation column of the gas chromatograph part and a detection part for detecting the components ionized in the ionization part;
• and
• a controller configured to control at least the ionization part,
• wherein the ionization part of the mass spectrometer part includes:
• an ion source box having a space for ionizing the components flowing out from the outlet of the separation column therein;
• a heater for adjusting a temperature of the ion source box;
• and
• a filament that is arranged outside of the ion source box and generates an electron for ionizing components flowing out from the outlet of the separation column,
• the controller is configured to perform feedback control of an output of the heater so that the temperature of the ion source box is adjusted to a predetermined temperature, and
• the controller is further configured, after an analysis starts and voltage is applied to the filament, to determine a correction amount of the output of the heater for cancelling temperature increasing of the ion source box due to heat from the filament based on a magnitude of current flowing through the filament, a magnitude of voltage applied to the filament, or a magnitude of emission current, and to correct the output of the heater, which is based on the feedback control, using the correction amount.