USE OF A FOURIER TRANSFORM SPECTROMETER TO STUDY ION FORMATION MECHANISMS IN A GLOW DISCHARGE
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Date
1994
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Ohio State University
Abstract
We have observed with a Bruker 120 Fourier transform spectrometer the $Ar^{+}$ emissions from the positive column of a glow discharge in a Ar/He(1/100) mixture. It was found that the $Ar^{+}$ emission lines exhibit two distinct Doppler shifts (one an order of magnitude greater than the other), which we characterize as ``large” and ``small”. Experimentally, the emissions from levels with energies $E<E^{*} (E^{\prime}=159850.3 cm^{-1},$ the excitation energy of $2^{3}S$ He) have ``large” doppler shifts while those with $E>E^{\prime}$ have ``small” ones. Our analysis leads one to believe that the emissions with ``large” Doppler shifts result from excitation of ground state $Ar^{+}$ via the reaction $He(2^{3}S)+Ar^{+}(3p^{5} \ ^{2}P^{3/2})$, while the emissions with ``Small” shifts arise from $Ar^{+}$ levels excited directly by electron impact on neutral Ar.
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Author Institution: Laser Spectroscopy Facility, Department of Chemistry, The Ohio University