Determination of impurity modes in the spectra of dissociative electron attachmentby benzofuran-3(2H)-one and benzofuran-2(3H)-one molecules

The method of negative ion mass spectrometry of resonant attachment of low energy electrons (0-15 eV) was used to identify and determine the type of impurities in the studied samples of benzofuran-3(2H)-one and benzofuran-2(3H)-one. An analysis of the decay channels of molecular negative ions (NIs) into stable fragments using the results of quantum-chemical calculations in the approximation of the density functional theory made it possible to determine the most probable structures of impurity molecules, as well as fragment ions ([M - H]-, [M - 2H]-, [M - СО]-).