A Signature of Roaming Dynamics in the Thermal Decomposition of Ethyl Nitrite: Chirped-Pulse Rotational Spectroscopy and Kinetic Modeling.
Chirped-pulse (CP) Fourier transform rotational spectroscopy is uniquely suited for near-universal quantitative detection and structural characterization of mixtures that contain multiple molecular and radical species. In this work, we employ CP spectroscopy to measure product branching and extract information about the reaction mechanism, guided by kinetic modeling. Pyrolysis of ethyl nitrite, CH3CH2ONO, is studied in a Chen type flash pyrolysis reactor at temperatures of 1000-1800 K. The branching between HNO, CH2O, and CH3CHO products is measured and compared to the kinetic models generated by the Reaction Mechanism Generator software. We find that roaming CH3CH2ONO → CH3CHO + HNO plays an important role in the thermal decomposition of ethyl nitrite, with its rate, at 1000 K, comparable to that of the radical elimination channel CH3CH2ONO → CH3CH2O + NO. HNO is a signature of roaming in this system.
Kirill
K
Prozument
Yury V
YV
Suleimanov
§IBM Research, Smarter Cities Technology Centre, Dublin 15, Ireland.
Beat
B
Buesser
∥Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States.
James M
JM
Oldham
William H
WH
Green
∥Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States.
Arthur G
AG
Suits
Robert W
RW
Field
CHEMKIN; CPmmW; Chen nozzle; Python; RMG-Py; Reaction Mechanism Generator, RMG; acetaldehyde; branching ratio; chirped pulse; combustion; dynamics; ethyl nitrite, C2H5ONO; formaldehyde, H2CO; kinetics; methyl nitrite, CH3ONO; microwave; millimeter wave; molecular beam; nitric oxide; nitrogen chemistry; nitrosyl hydride; nitroxyl; pyrolysis; reaction yield; roaming; spectroscopy; transition state theory; unimolecular reaction