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Photofragmentation laser-induced fluorescence imaging of CH3 by structured illumination in a plasma discharge

Nilsson, Sebastian LU ; Ravelid, Jonas LU ; Park, Jin LU ; Cha, Min Suk and Ehn, Andreas LU (2024) In Optics Express 32(15). p.26492-26499
Abstract

Methyl is crucial in plasma-assisted hydrocarbon chemistry, making precise in situ imaging essential for understanding various plasma applications. Its importance in methane chemistry arises from its role as a primary byproduct during the initial phase of methane dehydrogenation. Detecting the CH3 radical is challenging due to its high reactivity and the prevalence of strongly pre-dissociative electronically excited states. To address this, photofragmentation planar laser-induced fluorescence (PF-LIF) techniques have been developed. These involve laser-induced photodissociation of the CH3 radical into CH fragments, which are then probed using another laser. This method allows for both temporally and spatially resolved measurements.... (More)

Methyl is crucial in plasma-assisted hydrocarbon chemistry, making precise in situ imaging essential for understanding various plasma applications. Its importance in methane chemistry arises from its role as a primary byproduct during the initial phase of methane dehydrogenation. Detecting the CH3 radical is challenging due to its high reactivity and the prevalence of strongly pre-dissociative electronically excited states. To address this, photofragmentation planar laser-induced fluorescence (PF-LIF) techniques have been developed. These involve laser-induced photodissociation of the CH3 radical into CH fragments, which are then probed using another laser. This method allows for both temporally and spatially resolved measurements. However, quantifying the signal from photofragmented species is complicated by the overlap with naturally occurring CH fragments. We employ PF-LIF with structured illumination to distinguish photofragmented species from naturally occurring ones using a frequency-sensitive lock-in technique. This methodology is demonstrated in an atmospheric pressure dielectric barrier discharge (DBD) containing argon and methane, enabling spatially and temporally resolved data acquisition of the CH3 radical. This approach facilitates interference-free PF-LIF measurements of methyl in various applications.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Optics Express
volume
32
issue
15
pages
8 pages
publisher
Optical Society of America
external identifiers
  • scopus:85198717845
ISSN
1094-4087
DOI
10.1364/OE.531132
language
English
LU publication?
yes
id
84ac1a6f-4999-40cd-9c08-c11fb0573ebf
date added to LUP
2024-09-24 14:51:45
date last changed
2024-09-24 14:52:36
@article{84ac1a6f-4999-40cd-9c08-c11fb0573ebf,
  abstract     = {{<p>Methyl is crucial in plasma-assisted hydrocarbon chemistry, making precise in situ imaging essential for understanding various plasma applications. Its importance in methane chemistry arises from its role as a primary byproduct during the initial phase of methane dehydrogenation. Detecting the CH3 radical is challenging due to its high reactivity and the prevalence of strongly pre-dissociative electronically excited states. To address this, photofragmentation planar laser-induced fluorescence (PF-LIF) techniques have been developed. These involve laser-induced photodissociation of the CH3 radical into CH fragments, which are then probed using another laser. This method allows for both temporally and spatially resolved measurements. However, quantifying the signal from photofragmented species is complicated by the overlap with naturally occurring CH fragments. We employ PF-LIF with structured illumination to distinguish photofragmented species from naturally occurring ones using a frequency-sensitive lock-in technique. This methodology is demonstrated in an atmospheric pressure dielectric barrier discharge (DBD) containing argon and methane, enabling spatially and temporally resolved data acquisition of the CH3 radical. This approach facilitates interference-free PF-LIF measurements of methyl in various applications.</p>}},
  author       = {{Nilsson, Sebastian and Ravelid, Jonas and Park, Jin and Cha, Min Suk and Ehn, Andreas}},
  issn         = {{1094-4087}},
  language     = {{eng}},
  number       = {{15}},
  pages        = {{26492--26499}},
  publisher    = {{Optical Society of America}},
  series       = {{Optics Express}},
  title        = {{Photofragmentation laser-induced fluorescence imaging of CH3 by structured illumination in a plasma discharge}},
  url          = {{http://dx.doi.org/10.1364/OE.531132}},
  doi          = {{10.1364/OE.531132}},
  volume       = {{32}},
  year         = {{2024}},
}