Non-scrambling of hydrogen in NH₄ ⁺(H₂O)₃ clusters.

Experimentally, isotope distributions in decay products following low and medium energy collisions between ammoniated water clusters with water molecules have shown a low tendency to H/D exchange for the smallest clusters, with an increasing trend with cluster size. 11,12 For pure water clusters, in contrast, isotope-resolved fragmentation yields following low energy collisions of light water clusters with heavy water molecules were interpreted in ref. 13 as very rapid H/D exchange rates for small clusters, with rates decreasing with increasing cluster size, although the measured branching ratios in fact showed the opposite size dependence.

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