Unraveling the metastability of C n 2+ ( n = 2–4) Clusters

Abstract : Pure carbon clusters have received considerable attention for a long time. However, fundamental questions, such as what the smallest stable carbon cluster dication is, remain unclear. We investigated the stability and fragmentation behavior of Cn2+ (n = 2–4) dications using state-of-the-art atom probe tomography. These small doubly charged carbon cluster ions were produced by laser-pulsed field evaporation from a tungsten carbide field emitter. Correlation analysis of the fragments detected in coincidence reveals that they only decay to Cn–1+ + C+. During C22+ → C+ + C+, significant kinetic energy release (∼5.75–7.8 eV) is evidenced. Through advanced experimental data processing combined with ab initio calculations and simulations, we show that the field-evaporated diatomic 12C22+ dications are either in weakly bound 3Πu and 3Σg– states, quickly dissociating under the intense electric field, or in a deeply bound electronic 5Σu– state with lifetimes >180 ps.
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Submitted on : Tuesday, April 23, 2019 - 4:11:51 PM
Last modification on : Thursday, September 26, 2019 - 10:58:03 AM

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Zirong Peng, David Zanuttini, Benoit Gervais, Emmanuelle Jacquet, Ivan Blum, et al.. Unraveling the metastability of C n 2+ ( n = 2–4) Clusters. Journal of Physical Chemistry Letters, American Chemical Society, 2019, 10 (3), pp.581-588. ⟨10.1021/acs.jpclett.8b03449⟩. ⟨hal-02107343⟩

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