Frequently Asked Questions about GC-MS

Gas Chromatograph-Mass Spectrometry

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GCMS FAQs

What does m/z mean?
What are the measure­ment principles of MS?
Why are there decimal points in MS data?
With regard to resolution; What does R > 2M mean? Specifically, just how good is R > 2M?
What is S/N?
Please explain the principles, advantages, and disadvantages of EI, CI, and NCI easily.
Please explain the principles, advantages, and disadvantages of EI
Please explain the principles, advantages, and disadvantages of CI
Please explain the principles, advantages, and disadvantages of NCI
What are the QPMS advantages compared to the magnetic field type?
NCI: Why is the ion source changed between NCI and PCI?
NCI: When analysis is done without switching the NCI and EI ion source, don't some results deteriorate compared to normal EI?
Sensitivity: Please provide data comparing the sensitivity of TIC to the sensitivities of other GC detectors (FID, FPD, ECD).
What are the selection guidelines for reaction gases used with CI and NCI?