Abstract
The ammonium halide clusters from solid crystals of NH 4X (X = F, Cl, I) have been investigated by using a laser vaporization method and time of flight mass spectrometry. Positive ion clusters of NH 4 +(NH 3) n (HF) m ( n≤5, m≤5) and NH 4 +(NH 3) n (HI) m ( n≤10, m≤5) are detected with remarkable size effects. However, essentially no NH 4 +(NH 3) n (HCl) m and negative ammonium halide clusters are observed. These results are interpreted within the framework of intra-cluster interactions and transitions from a hydrogen bonded complex to an ionic crystal of the ammonium halide clusters.
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