Photofragmentation laser-induced fluorescence imaging of CH3 by structured illumination in a plasma discharge
(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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- author
- Nilsson, Sebastian LU ; Ravelid, Jonas LU ; Park, Jin LU ; Cha, Min Suk and Ehn, Andreas LU
- organization
- publishing date
- 2024-07
- 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}}, }