Chapter 4 Examining Chromatogram Data

4.In the Extracted Ion Chromatogram dialog box (Figure 4-1 on page 4-7), select one of the following from the Mass Range/Difference Type drop-down list:

•Center/Window, then type the mass of interest and the mass window for masses to include.

NOTE: When analyzing multiple components with similar masses, set a Window of less than 0.5 to include only the mass of interest.

•Range, then type the From and To values for masses to include.

NOTE: To improve the signal-to-noise ratio in the extracted ion chromatogram, set the starting range above the low-mass solvent ions.

NOTE: For more information on Constant Neutral Loss chromatograms, see Section 4.2.2, Creating a Constant Neutral Loss (CNL) Chromatogram.

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4-6 Applied Biosystems