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Welcome to the Mass Spec Terms wiki of mass spectrometry terminology.
This site was created in 2004 to support the IUPAC project Standard definitions of terms relating to mass spectrometry and was open for comment between 2004 and 2006. It now contains links to numerous mass spectrometry terminology definitions from the IUPAC Gold Book, Orange Book, 2013 Recommendations, and other sources. As of Wednesday September 10, 2025, the site contains 2,240 entries.
