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 are also finding to be useful in accurate mass Tandem (MS/MS) hybrid searches in LC-MS analyses.

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. Currently in nominal mass, but would be nice to have in accurate mass in future!

Excel DeltaMass Table (June 2021, 594 entries)

Free Training Videos and Associated Handouts

YouTube Advanced NIST Hybrid Search of EI Spectra
YouTube Advance NIST Hybrid Search for MS/MS (Tandem) Spectra
Handout NIST Hybrid Search of EI Spectra
Handout NIST Hybrid Search of Tandem (MS/MS) Spectra

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