Abstract
Velocity modulation and magnetic modulation methods as a means of selective modulation of ionic species have been applied for the first time to emission spectroscopy using a grating spectrometer. Magnetic modulation can achieve concentration modulation effects of up to 100% for ionic species such as N 2 + at all spectrometer resolving powers. Both neutral and ionic species may be modulated but the depth of modulation depends in a non-trivial way on the discharge conditions and region being observed. Velocity modulation in contrast is highly ion specific but the modulation depth depends strongly on the resolving power being used. Ion selective spectra using both techniques have been observed for CO + and N 2 + in the UV and far-UV regions.
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