Abstract
High-Rydberg fragments from collisions between [O 2] +, [NO] +, [CH] +, [NH] +, [OH] +, [CH 4] +, and [H 2] + ions of keV translational energy and inert gas (Xe, He) atoms were selectively field-ionized and the kinetic energy spectra of the resulting ions were obtained. The spectra were analyzed using the ion core model of high-Rydberg molecules and ions. General mechanisms for the production of HR fragments in keV ion-neutral collisons were established. Excitations to intermediate species leading to HR fragments were identified where possible. This mass spectrometric technique also permitted the analysis of the distribution of vibrational states in [H 2] + ion beams of different origin.
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