Data for: Application of the Expert Algorithm for Substance Identification (EASI) to the Electron Ionization (EI) Mass Spectra of Fentanyl Isomers and Analogs

The mass spectra are electron ionization mass spectra (EI-MS) taken at each scan across each GC peak of each replicate injection with no averaging. The spectra include the tails of the GC peaks, which often contain little or no signal from the eluting substance.

Such spectra can serve as negative controls or background spectra. The raw counts are provided in centroid/histogram format with 1 Da bins from m/z 40-500. Details are provided in the following publication: A. I. Adeoye, G. P. Jackson, "Application of the Expert Algorithm for Substance Identification (EASI) to the Electron Ionization (EI) Mass Spectra of Fentanyl Isomers and Analogs," Forensic Chem. 2025, 44, 100660.