Posted by: tvasailor | October 11, 2020

Excel DeltaMass Table for Hybrid Searches

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The Excel spreadsheet of DeltaMass values is very useful for determining the identity of a compound in a NIST hybrid EI or tandem library search. The values listed in the spreadsheet are common ones that I have found in my evaluation of EI library spectra. They would be even more useful when employing in conjunction with accurate mass measurements.

An odd DeltaMass value is indication that the number of nitrogens has changed by an odd number. Similar to nitrogen rule for molecular ions and their fragments in EI interpretation.

Excel DeltaMass Table

YouTube and Associated Handout for NIST Hybrid EI Search

YouTube Advanced NIST Hybrid Search of EI and MS/MS Spectra
Handout NIST Hybrid Search of EI and MS/MS Spectra-9-27-20

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