How is it that carbon tetrachloride shows up on FID?

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It's a weak signal, admittedly, but how does it show up at all? CCl4 is not combustible under atmospheric conditions; are the FID conditions (gas mixture + higher temperature) responsible for allowing carbon tet to form ions that the detector reflects the detection of an analyte?
I would think that is correct. The FID looks for ionization not simply combustion, if the temperature can knock off even an electron should give a signal. Dichloromethane and Chloroform are also not considered combustible but they give signals, increasing sensitivity with decreasing number of halogens.
The past is there to guide us into the future, not to dwell in.
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