DETECTION OF MOLECULAR IONS OF THERMALLY UNSTABLE COMPOUNDS BY IN BEAM ELECTRON IMPACT

Some remarkable characteristics of “in beam” electron impact spectra of several thermally unstable compounds have been reported. The spectra almost always exhibited the M+1 peak in place of M. Intensities of M+1 peaks of several thermally unstable compounds, of which molecular ion peaks are not observed with conventional direct inlet systems, are reported.