AI Article Synopsis
- The study explores how a 100 keV proton beam induces fragmentation in a doubly charged adenine molecule, focusing on understanding the dissociation dynamics and kinetic energy involved.
- Researchers used experimental data combined with computational methods to determine activation energies and observed metastable fragments, identifying one or two-step temporal mechanisms with lifetimes around 100-200 ns.
- The analysis revealed preferences in fragmentation pathways, notably favoring the emission of specific fragments, and allowed for comparisons of the dication's equivalent temperature with existing theoretical models.
Article Abstract
We present here a study that deals with the correlated fragmentation of a doubly charged adenine molecular target induced by a 100 keV proton beam. We have elucidated part of the dissociation dynamics for several channels and have obtained the corresponding kinetic energy released values. We have extracted activation energies by combining our experimental data with computations using the ab initio GAMESS code. We have observed metastability patterns against fragmentation, for which we have extracted the temporal mechanism (one or two steps). Subsequently, we have obtained lifetimes in the 100-200 ns range. In the simplest case of two-body fragmentation with the emission of mass 28, the determination of transition states and reaction paths has showed that emission of the H-C-N-H fragment is preferred to that of C-N-H(2). From the calculated activation barriers and lifetimes, we have deduced an equivalent temperature of the dication that we have compared with the existing models.
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| http://dx.doi.org/10.1063/1.2827476 | DOI Listing |
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