Single-charge transfer reactions of the ground and metastable states of Xe2+at 300K

Measurements are reported of the reactions of the ground ( 3 P) and metastable electronically excited ( 1 D 2 and 1 S 0 ) states of Xe 2+ ions with several atoms (Ar and Xe) and molecules (H 2 , N 2 , O 2 and CO 2 ) at 300K. The data were obtained using a selected-ion-flow-tube (SIFT) apparatus. State selection was achieved by introducing suitable 'chemical-filter' gases into the flow tube. The rate coefficients for the reactions with the molecules were large with the exception of some of the reactions of the 1 S 0 state. Conversely, the atom reactions were generally slow except for the 3 P state reaction with Ar in which a favourable pseudo-energy resonance must occur. All the molecular reactions proceeded via single-charge transfer and in the 1 D 2 reactions with molecules, dissociation of the product ion was usually observed.