The fragmentation of SF6 under O- and Al- negative ions impact

The fragmentation of SF6 under 15-30 keV O- and 20-30 keV Al- impact has been studied using a crossed beam technique. The recoil ions and ion pairs are identified in coincidence with scattered projectiles with different charge states by the usage of time-of-flight (TOF) mass spectroscopy. The yield ratios of fragment ions to SF+5 and the yield ratios of ion pairs to (S+,F+) in collision with O- and Al- are obtained and compared with those of H- and C-. It is found that the ratios have a very strong dependence on the momenta of the projectiles. Besides, by analyzing the TOF spectra , it is also found that more SF+n with n odd are produced than those with n even under O-, Al- impact, which also happened in collision with H- and C-, positive ion and electron impact. The dissociation channels of SF2+n are found to be insensitive to incident ionsâ energy and kind in our energy range.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author