Negative ion mass spectrometry. Part III. Spectra of some derivatives of dibenzophosphole 5-oxide

Abstract

The 70 eV negative ion mass spectra of 13 compounds based on the dibenzophosphole structure have been examined and found to exhibit yields of primary ions consistent with a model based on the preferential attachment of slow electrons at positive centres. From the patterns of yields of primary and secondary ions it is concluded that only relatively low levels of excitation are involved.