11 Shape of Atomic Lines Emitted by positive corona discharge N. Bonifaci, F. Aitken, H. Gharbi...
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Transcript of 11 Shape of Atomic Lines Emitted by positive corona discharge N. Bonifaci, F. Aitken, H. Gharbi...
11
Shape of Atomic Lines Emitted by positive corona discharge
N. Bonifaci, F. Aitken, H. Gharbi Tarchouna, G2Elab Grenoble, France V Atrazhev, Joint Institute for High Temperatures, Russia
V.A. Shakhatov, Topchiev of Petrochemical Synthesis Institute, RussiaJ. Eloranta Department of Chemistry,California State University, USA
K. von Haeften , Leicester University, Leicester, UK
G Vermeulen, Institut Néel Grenoble, France
22
Corona discharge in dense helium
Liquide
Light emission
Transport zone : E ~ kV/cm µe and µ+
Ionization zone : Ep~ MV/cm
Densities of the plasma particles (Ne and Np), Temperature, etc
2
Crucial importance for the modelling of plasmas produced by electric discharges
I ~ 0.1-50µA, DC V ~ kV
Applied power : 0.5-100mW
gap distance~mm
Rp ~ 0.1-0.2µm
Gas pressure ~ 1-100 bar
CCD Camera picture
Shape of atomic line 706 nm for different states of cryogenic Helium in a cell
0,0
0,2
0,4
0,6
0,8
1,0
1,2
"Red wings"
706.5nm
0.1MPa 0.6MPa 1MPaLiquid He
T=4,2KPositive
Inte
nsi
ty a
rb.u
nit
s
695 700 705 710 7150,0
0,2
0,4
0,6
0,8
1,0
"Blue wings"
706.6nm
Inte
nsity
, arb
.uni
ts.
Wavelength, nm.
NegativeT=5.1KGas
0.2MPaLiquid
0.7MPa 1.2MPa
POSITIVE NEGATIVE
Plane
e-e-
e-
- ---
e-e-
e-
+
Plane
+++
He+
He+
He+