title: Communication: Thermal unimolecular decomposition of syn-CH3CHOO: A kinetic study.
abstract: The thermal decomposition of syn-ethanal-oxide (syn-CH3CHOO) through vinyl hydrogen peroxide (VHP) leading to hydroxyl radical is characterized using a modification of the HEAT thermochemical protocol. The isomerization step of syn-CH3CHOO to VHP via a 1,4 H-shift, which involves a moderate barrier of 72 kJ/mol, is found to be rate determining. A two-dimensional master equation approach, in combination with semi-classical transition state theory, is employed to calculate the time evolution of various species as well as to obtain phenomenological rate coefficients. This work suggests that, under boundary layer conditions in the atmosphere, thermal unimolecular decomposition is the most important sink of syn-CH3CHOO. Thus, the title reaction should be included into atmospheric modeling. The fate of cold VHP, the intermediate stabilized by collisions with a third body, has also been investigated.
authors: Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, USA.
authors: Thanh Lam
authors: TL
authors: Nguyen
authors: Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, USA.
authors: Laura
authors: L
authors: McCaslin
authors: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA.
authors: Michael C
authors: MC
authors: McCarthy
authors: Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, USA.
authors: John F
authors: JF
authors: Stanton