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Instantaneous imaging of ozone in a gliding arc discharge using photofragmentation laser-induced fluorescence

Larsson, Kajsa LU ; Hot, Dina LU ; Gao, Jinlong LU ; Kong, Chengdong LU ; Li, Zhongshan LU ; Aldén, Marcus LU ; Bood, Joakim LU and Ehn, Andreas LU (2018) In Journal of Physics D: Applied Physics 51(13).
Abstract

Ozone vapor, O3, is here visualized in a gliding arc discharge using photofragmentation laser-induced fluorescence. Ozone is imaged by first photodissociating the O3 molecule into an O radical and a vibrationally hot O2 fragment by a pump photon. Thereafter, the vibrationally excited O2 molecule absorbs a second (probe) photon that further transits the O2-molecule to an excited electronic state, and hence, fluorescence from the deexcitation process in the molecule can be detected. Both the photodissociation and excitation processes are achieved within one 248 nm KrF excimer laser pulse that is formed into a laser sheet and the fluorescence is imaged using an intensified CCD camera.... (More)

Ozone vapor, O3, is here visualized in a gliding arc discharge using photofragmentation laser-induced fluorescence. Ozone is imaged by first photodissociating the O3 molecule into an O radical and a vibrationally hot O2 fragment by a pump photon. Thereafter, the vibrationally excited O2 molecule absorbs a second (probe) photon that further transits the O2-molecule to an excited electronic state, and hence, fluorescence from the deexcitation process in the molecule can be detected. Both the photodissociation and excitation processes are achieved within one 248 nm KrF excimer laser pulse that is formed into a laser sheet and the fluorescence is imaged using an intensified CCD camera. The laser-induced signal in the vicinity of the plasma column formed by the gliding arc is confirmed to stem from O3 rather than plasma produced vibrationally hot O2. While both these products can be produced in plasmas a second laser pulse at 266 nm was utilized to separate the pump- from the probe-processes. Such arrangement allowed lifetime studies of vibrationally hot O2, which under these conditions were several orders of magnitude shorter than the lifetime of plasma-produced ozone.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
gliding arc, imaging, laser-induced fluorescence, ozone, photofragmentation, plasma
in
Journal of Physics D: Applied Physics
volume
51
issue
13
publisher
IOP Publishing
external identifiers
  • scopus:85044113717
ISSN
0022-3727
DOI
10.1088/1361-6463/aab05b
language
English
LU publication?
yes
id
7e85c041-65df-461d-bb47-b3c5dac217e1
date added to LUP
2018-04-04 13:42:49
date last changed
2018-07-22 04:33:05
@article{7e85c041-65df-461d-bb47-b3c5dac217e1,
  abstract     = {<p>Ozone vapor, O<sub>3</sub>, is here visualized in a gliding arc discharge using photofragmentation laser-induced fluorescence. Ozone is imaged by first photodissociating the O<sub>3</sub> molecule into an O radical and a vibrationally hot O<sub>2</sub> fragment by a pump photon. Thereafter, the vibrationally excited O<sub>2</sub> molecule absorbs a second (probe) photon that further transits the O<sub>2</sub>-molecule to an excited electronic state, and hence, fluorescence from the deexcitation process in the molecule can be detected. Both the photodissociation and excitation processes are achieved within one 248 nm KrF excimer laser pulse that is formed into a laser sheet and the fluorescence is imaged using an intensified CCD camera. The laser-induced signal in the vicinity of the plasma column formed by the gliding arc is confirmed to stem from O<sub>3</sub> rather than plasma produced vibrationally hot O<sub>2</sub>. While both these products can be produced in plasmas a second laser pulse at 266 nm was utilized to separate the pump- from the probe-processes. Such arrangement allowed lifetime studies of vibrationally hot O<sub>2</sub>, which under these conditions were several orders of magnitude shorter than the lifetime of plasma-produced ozone.</p>},
  articleno    = {135203},
  author       = {Larsson, Kajsa and Hot, Dina and Gao, Jinlong and Kong, Chengdong and Li, Zhongshan and Aldén, Marcus and Bood, Joakim and Ehn, Andreas},
  issn         = {0022-3727},
  keyword      = {gliding arc,imaging,laser-induced fluorescence,ozone,photofragmentation,plasma},
  language     = {eng},
  month        = {03},
  number       = {13},
  publisher    = {IOP Publishing},
  series       = {Journal of Physics D: Applied Physics},
  title        = {Instantaneous imaging of ozone in a gliding arc discharge using photofragmentation laser-induced fluorescence},
  url          = {http://dx.doi.org/10.1088/1361-6463/aab05b},
  volume       = {51},
  year         = {2018},
}