[MOS] TOMORROW 3/10: Lord Lecture with Marsha Lester (University of Pennsylvania)

[Christine Brooks]

In following current MIT policy regarding COVID-19 (coronavirus), please DO NOT attend this lecture if you are feeling unwell or have recently traveled to or from areas outside the United States or specifically impacted areas within it. Please also practice good hygiene, particularly hand-washing.
More information from MIT Medical may be found here<https://medical.mit.edu/news/2020/01/2019-novel-coronavirus-updates-1>.

A number of boxed, individual lunches will be available following the lecture in order to comply with the most recent MIT guidelines regarding event catering and communal food sharing/serving, as buffet-style meals are strongly discouraged. While this is a departure from our typical post-lecture arrangements, this is an atypical situation and our priority is keeping everyone safe and minimizing risk.

Please join us for the 2020 Lord Lecture
presented by
Professor Marsha I. Lester
University of Pennsylvania

Tuesday, March 10, 2020 at 12pm
in the Grier Room (34-401A)<https://whereis.mit.edu/?go=34> at MIT


“Spectroscopic and Dynamical Probes of Alkene Ozonolysis Reaction Pathways”

Alkene ozonolysis is a primary oxidation pathway for alkenes, the most abundant organic compounds in the Earth’s troposphere after methane, and also an important source of atmospheric hydroxyl (OH) radicals. Alkene ozonolysis takes place through a complicated reaction pathway with multiple intermediates and barriers on the way to OH radicals and other products. A carbonyl oxide species, known as the Criegee intermediate (RR•COO), represents a critical branching point on the pathway that controls the products formed in this important class of reactions. Recent studies in this laboratory are focused on four-carbon Criegee intermediates, including unsaturated methyl vinyl ketone oxide (MVK-oxide) and methacrolein oxide (MACR-oxide) derived from isoprene ozonolysis. The Criegee intermediates are generated by alternative synthetic routes, characterized utilizing infrared and ultraviolet spectroscopic methods, and probed to examine the resultant dynamics. Infrared ‘fingerprint’ and electronic spectra reflecting •-conjugation of the Criegee intermediates are obtained, along with time- and energy-resolved studies of their unimolecular decay to OH radical products. The conformation and nature of the substituents (R, R•) of the Criegee intermediates are found to have a profound effect on their reaction dynamics. Complementary experiments under thermal conditions reveal the first direct kinetic measurements of MVK-oxide reactions with key tropospheric species and, along with theoretical modeling, provide insights on the impact of Criegee intermediates in the atmosphere.

No RSVP is required to attend

Christine Brooks
Administrative Assistant
Massachusetts Institute of Technology
Department of Chemistry
77 Massachusetts Ave, 6-333
Cambridge, MA 02139
p: 617.253.7239
e: cbrooks at mit.edu<mailto:cbrooks at mit.edu>

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