Measurement Of The <i>Ã</i>←<i>~x</i> Band Of 1- And 2-methylallyl Radicals Using Cavity Ringdown Spectroscopy
Markus, Charles R.
Loading…
Permalink
https://hdl.handle.net/2142/111203
Description
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
Issue Date
2021-06-23
Keyword(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.
Use this login method if you
don't
have an
@illinois.edu
email address.
(Oops, I do have one)
IDEALS migrated to a new platform on June 23, 2022. If you created
your account prior to this date, you will have to reset your password
using the forgot-password link below.
