Survival of polycyclic aromatic hydrocarbon knockout fragments in the interstellar medium
| Autor: | Henning T. Schmidt, Henning Zettergren, Ansgar Simonsson, MingChao Ji, Mark H. Stockett, Stephan Denifl, Michael Gatchell, Henrik Cederquist, João Ameixa |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Knockout
Chemical physics Astrophysics::High Energy Astrophysical Phenomena Science General Physics and Astronomy Polycyclic aromatic hydrocarbon General Biochemistry Genetics and Molecular Biology Dissociation (chemistry) Article Ion chemistry.chemical_compound Molecule Astrophysics::Galaxy Astrophysics Interstellar Medium chemistry.chemical_classification Thermal equilibrium Laboratory astrophysics Multidisciplinary General Chemistry PAH Storage Ring Coronene Interstellar medium Supernova chemistry Atomic and molecular collision processes |
| Zdroj: | Nature Communications, Vol 12, Iss 1, Pp 1-8 (2021) Nature Communications |
| ISSN: | 2041-1723 |
| Popis: | Laboratory studies play a crucial role in understanding the chemical nature of the interstellar medium (ISM), but the disconnect between experimental timescales and the timescales of reactions in space can make a direct comparison between observations, laboratory, and model results difficult. Here we study the survival of reactive fragments of the polycyclic aromatic hydrocarbon (PAH) coronene, where individual C atoms have been knocked out of the molecules in hard collisions with He atoms at stellar wind and supernova shockwave velocities. Ionic fragments are stored in the DESIREE cryogenic ion-beam storage ring where we investigate their decay for up to one second. After 10 ms the initially hot stored ions have cooled enough so that spontaneous dissociation no longer takes place at a measurable rate; a majority of the fragments remain intact and will continue to do so indefinitely in isolation. Our findings show that defective PAHs formed in energetic collisions with heavy particles may survive at thermal equilibrium in the interstellar medium indefinitely, and could play an important role in the chemistry in there, due to their increased reactivity compared to intact or photo-fragmented PAHs. Ion storage rings allow reactions to be studied over orders of magnitude in time, bridging the gap between typical experimental and astronomical timescales. Here the authors observe that polycyclic aromatic hydrocarbon fragments produced upon collision with He atoms at velocities typical of stellar winds and supernova shockwaves remain intact up to second timescales, thus may play an important role in interstellar chemistry. |
| Databáze: | OpenAIRE |
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