A Signature of Roaming Dynamics in the Thermal Decomposition of Ethyl Nitrite: Chirped-Pulse Rotational Spectroscopy and Kinetic Modeling

Abstract

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, CH[subscript 3]CH[subscript 2]ONO, is studied in a Chen type flash pyrolysis reactor at temperatures of 1000–1800 K. The branching between HNO, CH[subscript 2]O, and CH[subscript 3]CHO products is measured and compared to the kinetic models generated by the Reaction Mechanism Generator software. We find that roaming CH[subscript 3]CH[subscript 2]ONO → CH[subscript 3]CHO + 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 CH[subscript 3]CH[subscript 2]ONO → CH[subscript 3]CH[subscript 2]O + NO. HNO is a signature of roaming in this system.