Chemical Ionization Mass Spectrometry of Halomethanes with Tetramethylsilane as Reagent Gas

Article abstract of DOI:10.1002/oms.1210270610

Chemical ionization mass spectra of halomethanes measured using tetramethylsilane as reagent gas exhibit three major peaks corresponding to (1+), (1+) and (MeSi)2X(1+) ions (X = Cl, Br or I).Dihalomethanes CH2X2 form the most stable silylated molecular ions, whereas in the mass spectra of tetrahalomethanes (CX4) these ions have not been detected and the ions CX3(1+) are the most abundant.Production of bistrimethylsilylhalonium ions is the most pronounced process for haloforms (CHX3).