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Updated: May 28, 2026

Determination of the Gas-phase Acidities of Oligopeptides
Published on: June 24, 2013
A study of selected fragmentation paths of the ethyne dication: theory and experiment
R Flammini1, M Satta, E Fainelli
1CNR-IMIP, Istituto di Metodologie Inorganiche e dei Plasmi, Area della Ricerca di Roma 1, via Salaria km 29.300, CP10 00016, Monterotondo Scalo (RM), Italy. roberto.flammini@imip.cnr.it
Abstract:
The fragmentation of the C(2)H(2)(2+) dication, formed upon inner shell ionization and the subsequent Auger decay, has been studied by means of Auger electron-ion and Auger electron-ion-ion coincidence spectroscopy at four different kinetic energies of the Auger electron. The experimental investigation of three fragmentation paths leading to the C(2)H(+)/H(+), C(2)(+)/H(+) and C(+)/H(+) pairs has been complemented by theoretical calculations of the Potential Energy Surfaces (PES). It is found that when the amount of internal energy of the dication increases this is mainly transferred into the kinetic energy of the fragments of the second step of the dissociation.
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