A combined photoionization time-of-flight mass spectrometry and laser absorption spectrometry flash photolysis apparatus for simultaneous determination of reaction rates and product branching
Name
1.5024399.pdf
Description
Published version
Size
3.69 MB
Format
Adobe PDF
Checksum (MD5)
e7085b208fa566e69c2cc77a1e04b535
Author(s)
Middaugh, Joshua E
Buras, Zachary J
Matrat, Mickael
Chu, Te-Chun
Kim, Young-Seok
Alecu, Ionut M
Vasiliou, AnGayle K
Goldsmith, C Franklin
Green, William H
Date Issued
2018
Journal
Review of Scientific Instruments
Publisher
AIP Publishing
Version
Final published version
Abstract
© 2018 Author(s). In recent years, predictions of product branching for reactions of consequence to both combustion and atmospheric chemistry have outpaced validating experiments. An apparatus is described that aims to fill this void by combining several well-known experimental techniques into one: flash photolysis for radical generation, multiple-pass laser absorption spectrometry (LAS) for overall kinetics measurements, and time-resolved photoionization time-of-flight mass spectrometry (PI TOF-MS) for product branching quantification. The sensitivity of both the LAS and PI TOF-MS detection techniques is shown to be suitable for experiments with initial photolytically generated radical concentrations of ∼1 × 1012 molecules cm-3. As it is fast (μs time resolution) and non-intrusive, LAS is preferred for accurate kinetics (time-dependence) measurements. By contrast, PI TOF-MS is preferred for product quantification because it provides a near-complete picture of the reactor composition in a single mass spectrum. The value of simultaneous LAS and PI TOF-MS detection is demonstrated for the chemically interesting phenyl radical + propene system.
MIT Department
Massachusetts Institute of Technology. Department of Chemical Engineering
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1063/1.5024399
