Ionization and Dissociation by Electron Impact II. Boron Trifluoride and Boron Trichloride†

The formation of boron containing fragment ions from the ionization of BCl3

“…This simple technique, which is appropriate for our electron energy resolution and sampling interval, has been shown to yield estimates of appearance potentials in good agreement with more accurate methods of threshold determination [14,15]. In 1957, Marriot and Craggs [9] determined the threshold for BCl 2 2+ to be 33.77±0.07 eV and our appearance energy estimate for BCl 2 2+ is in good agreement with this value. The BCl 2 2+ dication was not detected by Jiao et al [10].…”

“…Investigations of the electron-impact ionization and photoionization of BCl 3 are limited [9][10][11][12]. A recent review of electron interactions with BCl 3 by Christophorou and Olthoff [13] remarks on the lack of data concerning the electron-collision cross-sections with BCl 3 and suggests that further experimental measurements of the total electron-impact ionization cross-section for BCl 3 are needed.…”

“…A recent review of electron interactions with BCl 3 by Christophorou and Olthoff [13] remarks on the lack of data concerning the electron-collision cross-sections with BCl 3 and suggests that further experimental measurements of the total electron-impact ionization cross-section for BCl 3 are needed. An early electron-impact study of the ionization of BCl 3 by Marriot and Craggs, using a Nier 60 • mass spectrometer, showed BCl 2 + to be the most abundant ion formed [9]. More recently, Jiao et al [10] determined the PICSs of BCl 3 using electron-impact ionization and Fourier transform mass spectrometry, producing absolute PICSs from threshold to 60 eV.…”

Electron Interactions With BCl3

“…29 A number of experimental studies contribute to an understanding of the molecular and electronic structure of the BCl 3 molecule. These include electron-impact excitation and ionization, [31][32][33] negative-ion formation, [31][32][33][34][35][36][37] electron-impact dissociation into excited fragments, [38][39][40] photoelectron spectra, 28,41,42 photoionization and photodissociation, [43][44][45][46][47][48][49] and photoabsorption and fluorescence measurements in the ultraviolet/visible ͑UV/VIS͒ region. 44 -52 Some of the photophysical studies incorporated mass analysis and fluorescence measurements and established the fragmentation patterns of BCl 3 at specific photon wavelengths ͑see Sec.…”

“…Electron attachment to BCl 3 has been experimentally investigated using electron beam [31][32][33][34]36,37 and electron swarm 61,93 methods. There have also been some studies of negative ion formation in BCl 3 gas discharges.…”