Dissociation mechanisms of excited CH3X (X = Cl, Br, and I) formed via high-energy electron transfer using alkali metal targets

摘要: High-energy electron transfer dissociation (HE-ETD) on collisions with alkali metal targets (Cs, K, and Na) was investigated for CH(3)X(+) (X = Cl, Br, I) ions by a charge inversion mass spectrometry. Relative peak intensities of the negative formed via HE-ETD strongly depend precursor target metals. The dependency is explained exothermicities respective processes. Peak shapes ions, especially X(-) which comprise triangle trapezoid, also trapezoidal part I(-) observed Na more dominant much broader than that Cs target. This dependence shows an inverse relation between width available energy, corresponds to exothermicity assuming formation fragment pair in their ground internal states. From comparison kinetic energy release value calculated from shape near-resonant level CH(3)I potential curve reported ab initio calculations, attributed CH(3) + I((2)P(3/2)) repulsive (3)Q(1) state CH(3)I, not photo-dissociation CH(3)I. observation trapezoid CH(2)I(-) indicates spontaneous (3)R(2) Rydberg state, although correlation relevant states has been any theoretical calculation.