Mar 01, 2018

Brett McGuire, Northwestern University

""From One to Two Dimensional Interstellar Carbon: A Synthesis of Laboratory, Observations, and Theory""

 In the last 50 years of astrochemical research, the realm of one-dimensional carbon chemistry (i.e. carbon chain molecules) has been well explored. Life, however, relies on two and three-dimensional carbon - branches, rings, bridges, and so forth. Here, we present the first rotational detection of a six-membered ring molecule in the interstellar medium (ISM), benzonitrile (c-C6H5CN), using deep Green Bank Telescope observations of TMC-1 combined with high-precision laboratory spectroscopy. We then explore the formation chemistry of this two-dimensional carbon molecule using a combined laboratory, quantum chemical, and modeling approach. We demonstrate the synthesis of cyclic species (benzene [c-C6H6] and benzonitrile) from a number of different simple, interstellar precursors, providing definitive evidence for facile bottom-up generation of two-dimensional carbon chemistry in the ISM.  The results show that benzonitrile can already be used as a reliable proxy for the presence of benzene in the ISM, and that there may exist a much larger array of 'hidden' aromatic species just beyond the current sensitivity of spectral surveys.

 

Event Details

Date:
Mar 01, 2018

Time:
3:30–5pm

Location:
4421 Sterling Hall

Notes:
Coffee served at 3:30pm; talk starts at 3:45pm

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