| 摘要 |
There is provided a pulsed flow modulation gas chromatograph mass spectrometer with supersonic molecular beams apparatus and method for improved sample analysis. The apparatus includes a gas chromatograph with an injector for the analysis of sample compounds, a first analytical column in the gas chromatograph, a sample storage, a gas pulse generator, a pressure generator, a conduit for transferring the sample compounds into a second analytical column having a different polarity than the polarity of the first analytical column, a second gas pulse generator, a transfer line for transferring the sample compounds into a supersonic nozzle, a member for adding a makeup gas to the output gas flow of the second analytical column before the supersonic nozzle, an element for reducing the flow rate of the added makeup gas, a supersonic nozzle for the expansion of the sample with the combined second analytical column and added makeup gas, a fly-through electron ionization ion source, a mass analyzer, an ion detector for the detection of the ions of the sample compounds after their mass analysis, a data processor and presenter, and a repeater for repeating the cycle of the first gas pulse of relatively high flow rate followed by the second gas pulse of intermediate flow rate.
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