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 Title: Measurement Of The Ã←~x Band Of 1- And 2-methylallyl Radicals Using Cavity Ringdown Spectroscopy Author(s): Markus, Charles R. Contributor(s): Okumura, Mitchio; Jones, Gregory H; Chao, Wen Subject(s): Radicals Abstract: The reduced reactivity of resonance-stabilized hydrocarbon radicals allows for them to reach higher concentrations in harsh environments such as flames or planetary atmospheres. Reactions between them remain rapid and could explain the formation of aromatics in aliphatic flames and molecular growth in soot formation processes. Here, we have measured the \textit{\~{A}}$\leftarrow$\textit{\~{X}} bands of the resonance-stabilized 1- and 2-methylallyl radicals near 410~nm using cavity ringdown spectroscopy. Although the absorption cross sections are relatively small, the extended lifetimes of the excited states allows for resolved vibronic structure of both C$_4$H$_7$ isomers. The transition has both $n\leftarrow\pi$ and $\pi^{*}\leftarrow n$ character, which we analyze using quantum chemical calculations. We also discuss how these results can be employed in chemical kinetics experiments. Issue Date: 2021-06-23 Publisher: International Symposium on Molecular Spectroscopy Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/111203 Date Available in IDEALS: 2021-09-24
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