Abstract
A hybrid tandem mass spectrometer has been constructed to study the dynamics of collision-induced dissociation processes in the energy range of less than 1 eV to several keV. A mass- and energy-analyzed high-energy ion beam is decelerated to low energies by a series of cylindrical and rectangular tube lenses. The decelerated ion beam collides with a supersonic neutral beam at right angles. Energy and mass analysis of the fragment ions is performed by a novel hemispherical energy analyzer followed by a quadrupole mass filter. The detector system can be rotated about the collision center to provide angular analysis of scattered fragment ions. Ion beams of moderate intensity have been obtained in the entire energy range, it is especially significant that good intensity is obtained in the lower threshold energy range of 0.2–5 eV. The performance of the instrument has been evaluated by an extensive series of ion transmission, focus, and energy measurements and by comparison of CID results with known mstastable and collision-induced dissociation processes.
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