Communication: Ultraviolet photodissociation dynamics of the simplest Criegee intermediate CH2OO
Journal Article
·
· Journal of Chemical Physics
- Univ. of Pennsylvania, Philadelphia, PA (United States); University of Pennsylvania
- Univ. of Pennsylvania, Philadelphia, PA (United States)
Here, the velocity and angular distributions of O 1D photofragments arising from UV excitation of the CH2OO intermediate on the B1A' ← X1A' transition are characterized using velocity map ion imaging. The anisotropic angular distribution yields the orientation of the transition dipole moment, which reflects the π* ← π character of the electronic transition associated with the COO group. The total kinetic energy release distributions obtained at several photolysis wavelengths provide detail on the internal energy distribution of the formaldehyde cofragments and the dissociation energy of CH2OO X1A' to O 1D + H2CO X1A1. A normal termination of the total kinetic energy distributions, after accounting for the different excitation energies, gives an upper limit for the CH2OO X1A' dissociation energy of D0 ≤ 54 kcal mol-1, which is compared with theoretical predictions including high level multi-reference ab initio calculations.
- Research Organization:
- Univ. of Pennsylvania, Philadelphia, PA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
- Grant/Contract Number:
- FG02-87ER13792
- OSTI ID:
- 1598546
- Alternate ID(s):
- OSTI ID: 22224135
- Journal Information:
- Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 14 Vol. 139; ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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