Df. Beale et al., SPATIALLY-RESOLVED OPTICAL-EMISSION FOR CHARACTERIZATION OF A PLANAR RADIO-FREQUENCY INDUCTIVELY-COUPLED DISCHARGE, Journal of vacuum science & technology. A. Vacuum, surfaces, and films, 12(5), 1994, pp. 2775-2779
Citations number
16
Categorie Soggetti
Physics, Applied","Materials Science, Coatings & Films
Planar radio frequency (rf) inductively coupled plasmas (ICP) are curr
ently being investigated as sources for materials processing. We have
characterized an Ar plasma ICP discharge using spatially resolved opti
cal emission spectroscopy. Abel inversion of line-integrated intensiti
es of Ar emission yields two-dimensional (r, z) profiles of emission
in a cylindrical volume, driven at one end by a spiral antenna with rf
power at 13.6 MHz. Measurements were made over a pressure range of 10
-100 mTorr, and power levels of 100 and 200 W. In all cases emission i
ntensity was found to peak in a ring-shaped region at one end of the c
ylinder adjacent to the location of the antenna, where the rf field is
strongest. A local maximum is also observed in most cases near the ce
nter of the volume where the electron density peaks [L. J. Mahoney, A.
E. Wendt, E. Barrios, and C. J. Richards, J. Appl. Phys. 76, 2041 (19
94)].