David C Zimmerman et al 2005 Plasma Sources Sci. Technol. 14 581 doi:10.1088/0963-0252/14/3/022
David C Zimmerman1,4, Roger McWilliams2 and David A Edrich3
Show affiliationsTwo-dimensional ion velocity distribution functions (IVDFs) of argon plasmas have been measured with optical tomography via laser-induced fluorescence (LIF). An inductive radio-frequency (RF) coil created the plasmas, and IVDFs were measured versus RF frequency, gas pressure and location (bulk plasma or presheath of a plate). Typical gas pressure was 0.3–0.4 mTorr, RF power 25 W and magnetic field 130 G. Effective perpendicular ion temperature decreased with increasing RF frequency, and changed little with pressure. Optical tomography reveals features of the presheath IVDF that cannot be deduced from LIF scans parallel and perpendicular to the plate alone. Progress also has been made toward performing optical tomography on a commercial ion beam source (Veeco/Ion Tech 3 cm RF Ion Source, Model #201). In particular, it has been discovered that the beam energy fluctuates in a range of about 20 eV over the timescale of a few minutes.
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.20.Hv Atomic, molecular, ion, and heavy-particle collisions
52.50.Qt Plasma heating by radio-frequency fields; ICR, ICP, helicons
Issue 3 (August 2005)
Received 17 February 2005, in final form 29 May 2005
Published 27 June 2005
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