Abstract
The Mini-Ring is a compact electrostatic ion storage ring designed for molecular relaxation dynamics studies. In order to accomplish an injection of the incoming ion beam, the electrode voltage settings appear to be quite critical to avoid large betatron oscillations. The beam injection was controlled by taking pictures of a test Ar+ ion beam with a digital camera. The amplitude of the betatron oscillation was measured by the impact position of neutral fragments exiting the ring on a position-sensitive detector. The broad spot observed for anthracene was attributed to the kinetic energy release resulting from the delayed unimolecular dissociation of anthracene by emission of a neutral C2H2.
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