%0 Journal Article
%T Optical and electrical diagnostics of microdischarges at moderate to high pressure in argon
%A Sismanoglu
%A B.N.
%A Cunha
%A C.L.A.
%A Gomes
%A M.P.
%A Caetano
%A R.
%A Grigorov
%A K.G.
%J Brazilian Journal of Physics
%D 2010
%I Scientific Electronic Library Online
%R 10.1590/S0103-97332010000400018
%X microdischarges at moderate to high pressure in argon were investigated. a hole opening diameter of 500 ¦Ìm direct current (dc) microhollow cathode discharges (mhcd) were characterized by electrical measurements and optical emission spectroscopy (oes) for pressures ranging between 90 and 800 torr and current from 5 to 20 ma. current-voltage characteristic curves were obtained as a function of the pressure for this hole diameter. mhcd enables stable dc discharges for molybdenum electrodes material at constant ar + 2%h2 flow of 0.03 l/min. optical emission spectroscopy and analysis of the spectral line broadening of plasma line emissions were performed in order to measure gas discharge parameters. electron number densities were obtained from h¦Â balmer line ( ~ 1014 cm-3). for the above mentioned discharge conditions, gas temperature was estimated to be 550 - 850 k from oh rotational bands. excitation temperature was measured based on two lines method (from atomic mo lines) and from 4p - 4s and 5p - 4s ar radiative transitions. hydrogen atom temperature was measured for 800 torr ( ~ 12000 k).
%K microdischarges
%K microhollow cathode discharges
%K optical emission spectroscopy.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0103-97332010000400018&lng=en&nrm=iso&tlng=en