Mass spectral investigations on benzeneseleninic acid

The mass spectra of benzeneseleninic acid and of diphenyl diselenide have been examined and a full analysis is reported. The fragmentation patterns and the fragment ions are discussed. A molecular-ion peak was not observed for benzeneseleninic acid; instead the ion with highest mass number appeared in a multiplet, with the most intense peak at m/e 314, having a general shape typical of the presence of two selenium atoms and corresponding to the diphenyl diselenide (C6H5–Se–Se–C6H5) ion.