Dissociation Process of Protonated Water Dimer and Trimer Clusters via COINTOF Mass Spectrometry: Identification of Neutral Water Dimer

Mahdi M. Harb; Khalil Abou-Saleh

doi:10.15866/irephy.v13i1.17902

Dissociation Process of Protonated Water Dimer and Trimer Clusters via COINTOF Mass Spectrometry: Identification of Neutral Water Dimer

Mahdi M. Harb⁽¹⁾, Khalil Abou-Saleh^(2*)

^(*) Corresponding author

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Abstract

Protonated water clusters are demonstrated to dissociate via two competing channels with respect to proton removal. Unexpectedly the exit channel leading to the neutral water dimer is found to be by far the most dominant process. A confirmation of this pertinent result was through the dissociation of which gave a neutral water dimer correlated to the charged fragment . Such a detailed analysis of fragmentation mechanism can be carried out by a new type of CID technique called COINTOF (COrrelated Ion and Neutral Time Of Flight) mass spectrometry. This method allows to explore dissociation processes by directly measuring charged and neutral fragments produced and, especially, their correlations within each single dissociative event. The resultant direct measurement of branching ratios for the production of neutral species in competitive dissociative channels is a major step in mass spectrometry. The COINTOF mass spectrometry can be applied not only to study relatively small molecular systems as in the present work, but also in future for CID experiments on large solvated molecules in order to probe, for instance, the localization of the solvent molecules and structural effects.
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Keywords

Mass Spectrometry; Collision Induced Dissociation CID; TOF; Cluster Fragmentation; Protonated Water Cluster; Proton Mobility

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