Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session F41: Division of Chemical Physics Prize Session
11:15 AM–12:51 PM,
Tuesday, March 6, 2018
LACC
Room: 502A
Sponsoring
Unit:
DCP
Chair: Timothy Zwier, Purdue Univ
Abstract ID: BAPS.2018.MAR.F41.2
Abstract: F41.00002 : Justin Jankunas Doctoral Dissertation Award in Chemical Physics Talk: Slow photoelectron velocity-map imaging (SEVI) spectroscopy of cryo-cooled anions
11:51 AM–12:27 PM
Presenter:
Marissa Weichman
(University of Colorado Boulder)
Author:
Marissa Weichman
(University of Colorado Boulder)
Recently, cryo-SEVI has been applied as a spectroscopic probe of transition state dynamics on neutral reactive surfaces, through photodetachment of a bound anion similar in geometry to the desired transition state. In the benchmark F + H2 reaction, we probe the transition state region through detachment of FH2− and directly observe new reactive resonances. Comparison to new theory allows for the assignment of resonances associated with quasi-bound states of the transition state and products.3 We also report spectra of the F + CH3OH hydrogen abstraction reaction through photodetachment of the CH3OHF− van der Waals clusters. We gain insight into the energetics and vibrational structure of transient complexes along the reaction coordinate of this complex polyatomic system.4
Finally, we report a new cryo-SEVI study of vinylidene (H2CC), a high energy isomer of acetylene, which is accessed directly through detachment of H2CC−. We find spectroscopic evidence that the isomerization of vinylidene to acetylene is highly state-specific, with excitation of the ν6 in-plane rocking mode resulting in appreciable tunneling-facilitated mixing with highly vibrationally excited states of acetylene.5
1JCP 137, 244201 (2012).
2PNAS 113, 1698 (2016).
3Science 349, 510 (2015).
4Nat. Chem. 9, 950 (2017).
5eScience 358, 336 (2017).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.MAR.F41.2
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