Calibrating a PSD Spectrum

2.Do any of the following:

•Click OK to accept the highlighted reference mass for matching.

•Select a different reference mass and click OK.

•Type new reference mass information in the Name, Theoretical Mass, Charge and Elemental Composition text boxes and select the mass type. Click OK to accept the reference mass for matching.

NOTE: You must type in a minus sign (-) for negative charge states.

•Type new reference mass information in the

appropriate text boxes, click Save or Save As to

8

add the information to the calibration reference

file, then click OK to accept the reference mass for

 

matching.

 

The PSD Calibration dialog box is displayed again (see

 

Figure 8-5 on page 8-13)with the observed mass and

 

the reference mass you selected displayed in the

 

Matched Peak list.

 

3.Repeat step 1 through step 2 until the desired peaks are in the matched list.

For optimum mass accuracy, take at least one mass from each segment, if possible.

The software does not allow you to add duplicate masses collected with the same PSD Mirror Ratio. However, if a mass exceeds the Mass Tolerance specified in Reference Matching Criteria, but has the same PSD Mirror Ratio, the software allows you to add it.

4.Complete the calibration as described in “Solving and plotting” on page 8-18.

Data Explorer™ Software User’s Guide

8-17