Reactions of Ar2+(3P) with CH4,C2H2 and NO2, of Ar2+(1S) with H2, N2, O2 CO2, C2H2 and CH4 of Ar+ with CH4, and NO2

Bond-forming and electron-transfer reactivity between Ar2+ and N2

“…As noted above, at high collision energies (keV), SET and DET pathways were identified, as expected, although these studies did not probe the reactivity at an electronic stateselective level. 32,[34][35][36]48,49 However, in 1999, Tosi et al 39 observed the formation of ArN 2+ following the collisions of Ar 2+ with N 2 , demonstrating a more complex chemistry in this collision system than the earlier studies had indicated. Indeed, molecular ions of ArN have attracted interest due to their rare gas bond and ArN + is a well-known contaminant in plasma-based mass spectrometry.…”

“…[27][28][29][30][31] In the upper reaches of these atmospheres, the formation of the Ar 2+ dication is likely, as recognised by Thissen et al 14 The bimolecular reactivity of Ar 2+ with a variety of rare gases and simple molecules has been studied previously. [32][33][34][35][36][37][38] Most of the early investigations of Ar 2+ -neutral collisions were carried out at 0.1-20 keV collision energies. At these significant collision energies only single-electron transfer (SET) and double-electron transfer (DET) channels were observed.…”

Bond-forming and electron-transfer reactivity between Ar2+ and O2

“…[25][26][27] In these atmospheres, the formation of the Ar 2+ dication is likely, as recognised by Thissen et al 12 The bimolecular reactivity of Ar 2+ was one of the first dicationic collision systems to be investigated, as beams of Ar 2+ are relatively easy to generate using electron ionisation. [28][29][30][31] In most of these early investigations of Ar 2+ -neutral collisions, only the dominant single-electron transfer (SET) and double-electron transfer (DET) channels were observed. These early experiments were usually carried out at high laboratory translational energies (0.1-20 keV) and involved rare gases or simple molecules as the neutral collision partner (e.g.…”

“…He, H 2 , N 2 , CO 2 , C 2 H 6 , C 6 H 6 ). 29,30,[32][33][34] More recent experiments, at lower collision energies (o100 eV), led to the observation of bond-forming chemistry following the interactions of Ar 2+ with various neutral species, revealing, for example, the formation of Ar-O, Ar-N and Ar-C bonds. [35][36][37][38][39][40] Indeed, the bimolecular reactivity of rare gas dications is now recognized as an effective route to forming these unusual chemical bonds.…”

“…24,25 The reactions between Ar 2+ and O 2 have been studied in experiments over a range of supra-thermal energies. 29,30,[32][33][34] In the earliest work, no chemical bond formation was observed, and the ion yields were explained using models involving varying contributions from SET and DET. In later work, Ascenzi et al 38 studied the reaction of Ar 2+ with O 2 using a combination of experiments and ab initio calculations.…”