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Communication: Ultraviolet photodissociation dynamics of the simplest Criegee intermediate CH2OO

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4824655· OSTI ID:1598546
 [1];  [2];  [2];  [2]
  1. Univ. of Pennsylvania, Philadelphia, PA (United States); University of Pennsylvania
  2. 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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Cited By (14)

Unimolecular dissociation dynamics of vibrationally activated CH3CHOO Criegee intermediates to OH radical products journal April 2016
The UV absorption spectrum of the simplest Criegee intermediate CH 2 OO journal January 2014
A kinetic study of the CH 2 OO Criegee intermediate self-reaction, reaction with SO 2 and unimolecular reaction using cavity ring-down spectroscopy journal January 2015
UV absorption probing of the conformer-dependent reactivity of a Criegee intermediate CH 3 CHOO journal January 2014
Impact of the water dimer on the atmospheric reactivity of carbonyl oxides journal January 2016
How big is the substituent dependence of the solar photolysis rate of Criegee intermediates? journal January 2018
UV absorption spectrum of the C2 Criegee intermediate CH 3 CHOO journal August 2014
Perspective: Spectroscopy and kinetics of small gaseous Criegee intermediates journal July 2015
Vibrational energy levels of the simplest Criegee intermediate (CH 2 OO) from full-dimensional Lanczos, MCTDH, and MULTIMODE calculations journal August 2015
Electronic spectroscopy of methyl vinyl ketone oxide: A four-carbon unsaturated Criegee intermediate from isoprene ozonolysis journal December 2018
The physical chemistry of Criegee intermediates in the gas phase journal July 2015
Unimolecular decay dynamics of Criegee intermediates: Energy-resolved rates, thermal rates, and their atmospheric impact journal December 2019
Observation of the simplest Criegee intermediate CH 2 OO in the gas-phase ozonolysis of ethylene journal March 2015
Direct kinetic measurement of the reaction of the simplest Criegee intermediate with water vapor journal January 2015

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