Chemical Ionization is a mass spectrometry technique used to produce ions from a sample. In this process, a reagent gas is ionized, typically by an electron beam, creating reactive ions. These ions then interact with the sample molecules, resulting in the formation of ions that can be analyzed. This method is often used for analyzing organic compounds because it provides softer ionization compared to Electron Ionization, leading to less fragmentation. As a result, Chemical Ionization can produce more intact molecular ions, making it easier to determine the molecular weight and structure of the compounds being studied.