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

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T1 - Instantaneous imaging of ozone in a gliding arc discharge using photofragmentation laser-induced fluorescence

AU - Larsson, Kajsa

AU - Hot, Dina

AU - Gao, Jinlong

AU - Kong, Chengdong

AU - Li, Zhongshan

AU - Aldén, Marcus

AU - Bood, Joakim

AU - Ehn, Andreas

PY - 2018/3/7

Y1 - 2018/3/7

N2 - 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.

AB - 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.

KW - gliding arc

KW - imaging

KW - laser-induced fluorescence

KW - ozone

KW - photofragmentation

KW - plasma

UR - http://www.scopus.com/inward/record.url?scp=85044113717&partnerID=8YFLogxK

U2 - 10.1088/1361-6463/aab05b

DO - 10.1088/1361-6463/aab05b

M3 - Article

VL - 51

JO - Journal Physics D: Applied Physics

T2 - Journal Physics D: Applied Physics

JF - Journal Physics D: Applied Physics

SN - 1361-6463

IS - 13

M1 - 135203

ER -