sentence: Chemists consider hard ionization to be shooting electrons into the sample molecules.
sentences_before: This is like the filament one would find in a standard incandescent light bulb. The electrons hit the molecules, causing the molecule to fragment in a characteristic way that can be repeated. EI has few, if any, fragments having a mass that is near the mass of the original molecule.
sentences_after: The use of 70 eV helps to compare the spectra generated from the test sample against known library spectra. The software searches the library spectra using a matching algorithm such as Probability Based Matching or dot-product matching. Many method standardization agencies now control these algorithms and methods to assure their objectivity.
concept_name: chemist
headings: Gas chromatography–mass spectrometry Analysis Types of ionization Electron ionization
categories: Mass spectrometry Laboratory techniques