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Methyl Radical Imaging in Methane-Air Flames Using Laser Photofragmentation-Induced Fluorescence

Li, Bo; Li, Xiaofeng; Yao, Mingfa and Li, Zhongshan LU (2015) In Applied Spectroscopy 69(10). p.1152-1156
Abstract
Imaging detection of methyl radicals has been performed in laminar premixed methane-air flames at atmospheric pressure. A nanosecond Q-switched neodymium-doped yttrium aluminum garnet (Nd : YAG) laser was employed to provide the fifth-harmonic-generated 212.8 nm laser beam. The intense ultraviolet (UV) laser pulse was sent through the flame front to photodissociate The methyl (CH3) radicals in the reaction zone of the flames stabilized on a piloted jet flame burner. The emission spectra from the photodissociated fragments were collected using an imaging spectrometer with the flame-front structure spatially resolved. Combining the spatial and spectral information, we recognized that the emission from the (A-X) methine (CH) transitions... (More)
Imaging detection of methyl radicals has been performed in laminar premixed methane-air flames at atmospheric pressure. A nanosecond Q-switched neodymium-doped yttrium aluminum garnet (Nd : YAG) laser was employed to provide the fifth-harmonic-generated 212.8 nm laser beam. The intense ultraviolet (UV) laser pulse was sent through the flame front to photodissociate The methyl (CH3) radicals in the reaction zone of the flames stabilized on a piloted jet flame burner. The emission spectra from the photodissociated fragments were collected using an imaging spectrometer with the flame-front structure spatially resolved. Combining the spatial and spectral information, we recognized that the emission from the (A-X) methine (CH) transitions located at 431 nm was generated from the CH3 photolysis and could be used to visualize the distribution of CH3 radicals. With proper filtering, the high-power UV laser (around 15 mJ/pulse) provided by the compact Nd : YAG laser makes it possible to visualize CH3 distribution naturally generated in the reaction zone of laminar methane-air premixed flames. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Methyl radical, Laser photofragmentation, Imaging, Fluorescence
in
Applied Spectroscopy
volume
69
issue
10
pages
1152 - 1156
publisher
Society for Applied Spectroscopy
external identifiers
  • wos:000362617600005
  • scopus:84960495283
ISSN
1943-3530
DOI
10.1366/15-07869
language
English
LU publication?
yes
id
644a7e80-c938-4442-9d0c-51950be373c7 (old id 8212282)
date added to LUP
2015-11-27 14:36:25
date last changed
2017-09-17 03:04:01
@article{644a7e80-c938-4442-9d0c-51950be373c7,
  abstract     = {Imaging detection of methyl radicals has been performed in laminar premixed methane-air flames at atmospheric pressure. A nanosecond Q-switched neodymium-doped yttrium aluminum garnet (Nd : YAG) laser was employed to provide the fifth-harmonic-generated 212.8 nm laser beam. The intense ultraviolet (UV) laser pulse was sent through the flame front to photodissociate The methyl (CH3) radicals in the reaction zone of the flames stabilized on a piloted jet flame burner. The emission spectra from the photodissociated fragments were collected using an imaging spectrometer with the flame-front structure spatially resolved. Combining the spatial and spectral information, we recognized that the emission from the (A-X) methine (CH) transitions located at 431 nm was generated from the CH3 photolysis and could be used to visualize the distribution of CH3 radicals. With proper filtering, the high-power UV laser (around 15 mJ/pulse) provided by the compact Nd : YAG laser makes it possible to visualize CH3 distribution naturally generated in the reaction zone of laminar methane-air premixed flames.},
  author       = {Li, Bo and Li, Xiaofeng and Yao, Mingfa and Li, Zhongshan},
  issn         = {1943-3530},
  keyword      = {Methyl radical,Laser photofragmentation,Imaging,Fluorescence},
  language     = {eng},
  number       = {10},
  pages        = {1152--1156},
  publisher    = {Society for Applied Spectroscopy},
  series       = {Applied Spectroscopy},
  title        = {Methyl Radical Imaging in Methane-Air Flames Using Laser Photofragmentation-Induced Fluorescence},
  url          = {http://dx.doi.org/10.1366/15-07869},
  volume       = {69},
  year         = {2015},
}