Arrange the ion monitoring modes that are used to generate a chromatogram in gas

Question

Arrange the ion monitoring modes that are used to generate a chromatogram in gas chromatography mass spectrometry (GC-MS) from most selective (top) to the least selective (bottom) Which of the following correctly describes what a user would observe if they collected a chromatogram generated in selected ion monitoring mode? A chromatogram showing the detector signal (summed total ion intensity) plotted against elution time. A chromatogram of ion intensity from one or more selected m/z values versus elution time. A chromatogram showing a plot of absorption versus each m/z value determined by the mass spectrometer. A chromatogram showing the intensity from selected collision generated ion fragments plotted against time.

Explanation / Answer

Part A) Arrange the ion monitoring modes that are used to generate a chromatogram in gas chromatography-mass spectrometry (GC-MS) from the most selective (top) to the least selective (bottom)

Selected reaction monitoring (Most selective)

Selected ion monitoring

Reconstructed total ion chromatogram. (Least selective)

Part B) Which of the following correctly describes what a user would observe if they collected a chromatogram generated in selected ion monitoring mode?

A chromatogram of ion intensity from one or more selected m/z values versus elution time.

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