Ion beam characterization in the Mini-Ring and kinetic energy release measurement of unimolecular decay of anthracene cations

M Ji (1, 2) , Guillaume Montagne (1, 2) , Richard Brédy (1, 2) , Jérôme Bernard (1, 2) , L Chen (1, 2) , Serge Martin (1, 2)

1 LASIM - Laboratoire de Spectrométrie Ionique et Moléculaire
2 ILM - Institut Lumière Matière [Villeurbanne]

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.

Domaines: Sciences de l'ingénieur [physics]; Chimie; Physique [physics]

M Ji, Guillaume Montagne, Richard Brédy, Jérôme Bernard, L Chen, et al.. Ion beam characterization in the Mini-Ring and kinetic energy release measurement of unimolecular decay of anthracene cations. Physica Scripta, 2013, T156, pp.014092. ⟨10.1088/0031-8949/2013/T156/014092⟩. ⟨hal-03146475⟩