Naslov
H /alpha emission in the presence of dust in an Ar-C2H2 radio-frequency discharge
(H/alpha emission in the presence of dust in an Ar-C2H2 radio-frequency discharge)

Autori
Stefanović, Ilija ; Kovačević, Eva ; Berndt, Johannes ; Winter Jörg

Izvornik
New Journal of Physics (1367-2630) 5 (2003); 31-39

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, focus article, znanstveni

Ključne riječi
Optical spectroscopy; atomic hydrogen; dusty plasma; sheat behavior; regimes
(Optical spectroscopy; atomic hydrogen; dusty plasma; sheat behavior; diagnostic tools)

Sažetak
We present the results of time resolved spectroscopy measurements of the H line of atomic hydrogen in an Ar-C2H2 radiofrequency plasma. The presence of the fast (high-energy) and slow (low-energy) components of the hydrogen atoms can be deduced from the Doppler broadening of the H line. With the appearance of the dust particles, the H profile became narrower, indicating reduction of the fast component. We discuss several mechanisms for the formation of the fast hydrogen atoms in our plasma. The main cause for the reduction of the hydrogen atom fast component is the plasma change from electropositive to electronegative, decreasing the sheath's width and voltage. The change of plasma conditions coincides with the end of the dust coagulation/agglomeration when the dust particles become multiply negatively charged. We propose here a new experimental technique for detection of the dust coagulation/agglomeration phase.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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