GRAND-PAHs · A laboratory study of astronomically relevant large polycyclic aromatic hydrocarbons (GRAND-PAHs)
Horizon 2020 — Marie Skłodowska-Curie Actions
- Duration
- 2019-09-01 → 2021-08-31
- EU contribution
- €175,572
- Participants
- 1
- Scheme
- MSCA-IF-EF-ST
Lines connect the coordinator with its partners.
Results in brief
A laboratory study of astronomically relevant large polycyclic aromatic hydrocarbons (GRAND-PAHs)
Astronomical observations reveal that large polycyclic aromatic hydrocarbons (PAHs) exist in copious amounts in the interstellar medium (ISM). They contain up to 20% of the entire carbon budget in the Universe and as such need to be understood in terms of their origins (how they form) and their eventual fate (how they are destroyed). The overall objective of this project is to measure the fragmentation pathways of very large polycyclic aromatic hydrocarbons (PAHs) in a laboratory setting by utilizing several complementary radiation techniques to gain a deeper understanding of the nature of GRAND PAHs and their overall role in the chemistry and physics of our Universe. The major finding of this fellowship is that (GRAND)PAHs fragment in universal ways, i.e., no matter the size or shape of PAHs, their fragmentation products appear to be almost identical. This gives rise to particular carbon clusters that may easily build up in the universe before being inducted into molecular clouds. More importantly, these fragments are likely candidates as carriers of the Diffuse Interstellar Bands (DIBs), which are a century old mystery at the time of writing.
Data: CORDIS, © European Union
Project objective
The research objective of this proposal is to use complimentary laboratory techniques to study the photo-ionization and photo-dissociation of large (>50 C-atoms) polycyclic aromatic hydrocarbon (PAH) molecules. These molecules are omnipresent in the interstellar medium (ISM) where they are irradiated and electronically excited by ultraviolet photons. This excitation causes PAHs to ionize and/or fragment, contributing substantially to the molecular complexity in space. The underlying chemical pathways are largely unexplored and recent studies show that PAHs play a key role in the formation of i) smaller organic species along a top-down scenario, ii) fullerenes and carbon cages and iii) graphene flakes, i.e., bare PAH skeletons that have not been observed in the ISM yet. These molecules will be studied with a rather unique, fully operational and mobile 'instrument for Photodynamics of PAHs' (i-POP) that is capable of studying the fragmentation of mass selected PAH cations. The mobility of i-POP allows its implementation at different light sources, which include Synchrotron SOLEIL (Saint Aubin - FR) and the free electron laser laboratory FELIX (Nijmegen - NL). The project is timely as its results will actively contribute to European excellence by producing laboratory data relevant to data interpretation from international multi-billion Euro research facilities such as The Atacama Large Millimeter/submillimeter Array (ALMA) and the James Webb Space Telescope (JWST). The training objective is aligned along this research program. The existing expertise in physical chemistry will be extended to the emerging field of astrochemistry and unique knowledge will be obtained through research projects at Synchrotron SOLEIL and FELIX. A secondment is planned in the first year at FELIX to expand my experimental portfolio to include varied irradiation techniques including a free electron laser, to obtain complementary information about astronomically relevant chemical species.
Original text from CORDIS.
Participants
- UNIVERSITEIT LEIDEN · LeidenCoordinatorNetherlands
Links
Data: CORDIS, © European Union