Probing the bimolecular product channels of O + C3H5 via unimolecular dissociation

PHYS 403

Benjamin L. FitzPatrick1, Kai-Chung Lau1, Laurie J. Butler, L-BUTLER@UCHICAGO.EDU1, and Jim J. Lin, jimlin@gate.sinica.edu.tw2. (1) Department of Chemistry, The University of Chicago, The James Franck Institute, 5640 S. Ellis Ave., Chicago, IL 60637, (2) Institute of Atomic and Molecular Sciences, Academia Sinica, P.O.Box 23-166, Taipei, 106, Taiwan
These experiments investigate the O(3P) + allyl reaction by using the photodissociation of epichlorohydrin at 193 nm in a crossed laser-molecular beam apparatus to generate the radical intermediate having the oxygen atom bridging the middle and one terminal carbon atom. The energetically accessible product channels include acrolein + H, formaldehyde + C2H3 , ketene + CH3 , ethene + CHO, and C2H5 + CO. The formation of acrolein from HCl elimination was also present using this photolytic precursor. These channels were investigated by measuring the velocity distribution of the reaction products, detecting them using tunable VUV ionization dover a range spanning 7 to 15 eV. We present our preliminary analysis of this new data which probes the dynamics of this bimolecular reaction from one key radical intermediate to the resulting product channels. The data allow us to benchmark the predictions of the product branching based on the transition states calculated by Choi and co-workers [J. -H. Park, H. Lee,and J. -H. Choi, J. Chem. Phys. 119, 8966 (2003)].
 

Poster Session
7:30 PM-10:00 PM, Wednesday, 13 September 2006 Moscone Center -- Hall D, Poster

Sci-Mix
8:00 PM-10:00 PM, Monday, 11 September 2006 Moscone Center -- Hall D, Sci-Mix

Division of Physical Chemistry

The 232nd ACS National Meeting, San Francisco, CA, September 10-14, 2006