Abstract
Selected ion flow drift tube techniques have recently been used to investigate the role of vibrational excitation of molecular ions in collisions with neutrals. A model by Ferguson explaining the quenching of vibrational ionic excitation via transient complex formation followed by vibrational predissociation is supported by a series of systematic data on O 2 + ( v) and NO + ( v) ions. The excitation and de-excitation of molecular ions in collisions with helium buffer gas atoms has been shown to be quite efficient at elevated E/N. The influence of kinetic and vibrational energy, respectively, on the reactivity of molecular ions can be spearated quantitatively for a variety of slow ion/molecule reactions. The inclusion of an octopole storage section at the exit of the ion source of a selected ion flow drift tube allows investigations of the nascent state distributions of ions produced via different ionic reactions.
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