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Can Third-Body Stabilization of Bimolecular Collision Complexes in Cold Molecular Clouds Happen?

Journal Article · · Molecular Physics
For more than half a century, networks of radiative association, dissociative recombination, and bimolecular reactions have been postulated to drive the low-temperature chemistry of cold molecular clouds. Third-body stabilizations of collision complexes have been assumed to be 'irrelevant' due to short lifetime of such complexes. Here, we conduct crossed molecular beam studies of ground state atomic silicon with diacetylene in combination with electronic structure calculations and microcanonical kinetics models operating under cold molecular cloud conditions. Our combined experimental, electronic structure, and microcanonical kinetics modelling investigations provide compelling evidence that three-body collisions of molecular hydrogen with long-lived reaction intermediates accessed through intersystem crossing are prevalent deep inside molecular clouds. This concept might be exportable to reactions involving polycyclic aromatic hydrocarbons thus affording a versatile machinery to complex organics via third-body stabilizations of bimolecular collision complexes deep inside cold molecular clouds.
Research Organization:
Argonne National Laboratory (ANL)
Sponsoring Organization:
National Science Foundation (NSF); Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq); USDOE Office of Science - Office of Basic Energy Sciences - Chemical Sciences, Geosciences, and Biosciences Division
DOE Contract Number:
AC02-06CH11357
OSTI ID:
2375490
Journal Information:
Molecular Physics, Journal Name: Molecular Physics Journal Issue: 1-2 Vol. 122; ISSN 0026-8976
Country of Publication:
United States
Language:
English

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