skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Prompt release of O 1D products upon UV excitation of CH2OO Criegee intermediates

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4977987· OSTI ID:1465943

We report that velocity map imaging has been used to characterize the angular and velocity distributions of O 1D photofragments arising from UV excitation of the simplest Criegee intermediate CH2OO in the long wavelength tail region (364 to 417 nm) of the B1A'–X1A' spectrum. The O 1D images exhibit anisotropic angular distributions indicative of rapid dissociation to H2CO X1A1 + O 1D products, which occurs faster than the rotational period (ps) of CH2OO. As a result, the broad oscillatory structure reported previously in the long wavelength region of the UV absorption spectrum is attributed to short-lived resonances associated with the excited B1A' state of CH2OO, which decay by nonadiabatic coupling to repulsive singlet states. The total kinetic energy distributions show that nearly half of the available energy, on average, is partitioned to product translation. The balance results in significant internal excitation of the H2CO co-fragments. In conclusion, the product anisotropy and energy partitioning are unchanged across the UV spectrum and consistent with previously reported experimental and theoretical findings of the CH2OO B-X transition moment and dissociation energy to H2CO X1A1 + O 1D products.

Research Organization:
Univ. of Pennsylvania, Philadelphia, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-87ER13792
OSTI ID:
1465943
Journal Information:
Journal of Chemical Physics, Vol. 147, Issue 1; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

References (39)

Reactions between Criegee Intermediates and the Inorganic Acids HCl and HNO 3 : Kinetics and Atmospheric Implications journal July 2016
Quantum dynamical investigation of the simplest Criegee intermediate CH 2 OO and its O–O photodissociation channels journal October 2014
Detailed mechanism of the CH 2 I + O 2 reaction: Yield and self-reaction of the simplest Criegee intermediate CH 2 OO journal September 2014
Research frontiers in the chemistry of Criegee intermediates and tropospheric ozonolysis journal January 2014
Observation of the simplest Criegee intermediate CH 2 OO in the gas-phase ozonolysis of ethylene journal March 2015
Direct evidence for a substantive reaction between the Criegee intermediate, CH 2 OO, and the water vapour dimer journal January 2015
UV absorption spectrum of the C2 Criegee intermediate CH 3 CHOO journal August 2014
Relatively Selective Production of the Simplest Criegee Intermediate in a CH 4 /O 2 Electric Discharge: Kinetic Analysis of a Plausible Mechanism journal November 2014
High resolution absolute absorption cross sections of the B̃ 1 A′–X̃ 1 A′ transition of the CH 2 OO biradical journal January 2015
Rate Coefficients of C1 and C2 Criegee Intermediate Reactions with Formic and Acetic Acid Near the Collision Limit: Direct Kinetics Measurements and Atmospheric Implications journal March 2014
Communication: Ultraviolet photodissociation dynamics of the simplest Criegee intermediate CH 2 OO journal October 2013
Absolute Ultraviolet Absorption Spectrum of a Criegee Intermediate CH 2 OO journal November 2013
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
Ion imaging study of IO radical photodissociation: Accurate bond dissociation energy determination journal May 2008
Unimolecular Isomerizations and Oxygen Atom Loss in Formaldehyde and Acetaldehyde Carbonyl Oxides. A Theoretical Investigation journal January 1996
A full-dimensional multilayer multiconfiguration time-dependent Hartree study on the ultraviolet absorption spectrum of formaldehyde oxide journal September 2014
UV Absorption Spectrum and Photodissociation Channels of the Simplest Criegee Intermediate (CH 2 OO) journal December 2014
UV spectroscopic characterization of an alkyl substituted Criegee intermediate CH 3 CHOO journal June 2013
Ultraviolet Spectrum and Photochemistry of the Simplest Criegee Intermediate CH 2 OO journal December 2012
Perspective: Spectroscopy and kinetics of small gaseous Criegee intermediates journal July 2015
Total radical yields from tropospheric ethene ozonolysis journal January 2011
Spectroscopy of the Simplest Criegee Intermediate CH 2 OO: Simulation of the First Bands in Its Electronic and Photoelectron Spectra journal August 2012
Electronic structure of the Criegee intermediate. Ramifications for the mechanism of ozonolysis journal May 1975
Two-dimensional charged particle image inversion using a polar basis function expansion journal November 2004
A CCSD (T) investigation of carbonyl oxide and dioxirane. Equilibrium geometries, dipole moments, infrared spectra, heats of formation and isomerization energies journal July 1993
The UV absorption spectrum of the simplest Criegee intermediate CH 2 OO journal January 2014
Kinetics of the reactions of CH2Br and CH2I radicals with molecular oxygen at atmospheric temperatures journal January 2006
Direct Determination of the Simplest Criegee Intermediate (CH 2 OO) Self Reaction Rate journal June 2014
Ion imaging studies of the photodissociation dynamics of CH2I2 at 248nm journal December 2013
Direct kinetic measurement of the reaction of the simplest Criegee intermediate with water vapor journal January 2015
Infrared-driven unimolecular reaction of CH3CHOO Criegee intermediates to OH radical products journal September 2014
Infrared Absorption Spectrum of the Simplest Criegee Intermediate CH2OO journal April 2013
Communication: Determination of the molecular structure of the simplest Criegee intermediate CH 2 OO journal September 2013
Direct Kinetic Measurements of Reactions between the Simplest Criegee Intermediate CH 2 OO and Alkenes journal March 2014
The Spectroscopy of Formaldehyde and Thioformaldehyde journal October 1983
The gas-phase ozonolysis of unsaturated volatile organic compounds in the troposphere journal January 2008
Direct Kinetic Measurements of Criegee Intermediate (CH2OO) Formed by Reaction of CH2I with O2 journal January 2012
Heats of formation of the Criegee formaldehyde oxide and dioxirane journal November 2007
Velocity map imaging of O-atom products from UV photodissociation of the CH2OO Criegee intermediate journal June 2015

Cited By (2)

How big is the substituent dependence of the solar photolysis rate of Criegee intermediates? journal January 2018
Electronic spectroscopy of methyl vinyl ketone oxide: A four-carbon unsaturated Criegee intermediate from isoprene ozonolysis journal December 2018

Similar Records

Velocity map imaging of O-atom products from UV photodissociation of the CH2OO Criegee intermediate
Journal Article · Fri Jun 05 00:00:00 EDT 2015 · Journal of Chemical Physics · OSTI ID:1465943

Velocity map imaging of O-atom products from UV photodissociation of the CH{sub 2}OO Criegee intermediate
Journal Article · Sun Jun 07 00:00:00 EDT 2015 · Journal of Chemical Physics · OSTI ID:1465943

Communication: Ultraviolet photodissociation dynamics of the simplest Criegee intermediate CH2OO
Journal Article · Fri Oct 11 00:00:00 EDT 2013 · Journal of Chemical Physics · OSTI ID:1465943