Mf. Dony et al., COMPARISON OF DIRECT-CURRENT AND RADIO-FREQUENCY ARGON MAGNETRON DISCHARGES BY OPTICAL-EMISSION AND ABSORPTION-SPECTROSCOPY, Journal of vacuum science & technology. A. Vacuum, surfaces, and films, 15(4), 1997, pp. 1890-1896
Citations number
12
Categorie Soggetti
Physics, Applied","Materials Science, Coatings & Films
A magnetron sputtering discharge is studied by optical emission and ab
sorption spectroscopy, following an experimental design procedure. The
33-mm-diam target is made in an aluminium base alloy. The radiation i
s focused on an optical fiber and is spectrally analyzed in a Jobin-Yv
on computer-controlled 1.0 m Czerny-Turner scanning monochromator. The
spatial resolution is 2 mm. Emission line intensities from the Ar spu
ttering gas and the sputtered species are studied as a function of geo
metrical and physical discharge parameters: excitation mode (rf or dc)
, target thickness, gas discharge pressure, electric power (rf) or cur
rent (dc), and the distance from the target, In emission spectroscopy,
two Ar I lines are studied: Ar I 425.9 nm 3p(5)5p(3p(1)) -3p(5)4s(1s(
2)) and Ar I 451.1 nm 3p(5)5p(3p(5))-3p(5)4s(1s(2)) and also an Ar II
line 442.6 nm 3p(4)4p(D-4(0))-3p(4)4s(P-4). The first excited level co
nfiguration of Ar (3p(5)4s) contains two metastable (1s(5),1s(3)) and
two resonant (1s(4),1s(2)) levels. The Al excited and ground states ha
ve also been analyzed: the Al I 3p(2)p(0)-4s(2)s and Al I 3p(2)P(0)-4s
(2)S. By use of hollow-cathode lamps, absorption due to aluminum atoms
and argon metastable and resonant atom states densities are evaluated
, as a function of the same parameters as in emission. The experimenta
l responses (emission and absorption intensities) are fitted by a quad
ratic equation in which interactions between factors are included. The
influences of the main factors are deduced and discussed. (C) 1997 Am
erican Vacuum Society.