Abstract
Recent basic studies on electron attachment to laser‐excited molecules show that electron attachment to electronically‐excited states can have orders of magnitude larger cross sections compared to the respective ground electronic states. Even though systematic studies have not been conducted, there are indications that electronically‐excited states may play a significant role in negative ion formation in gas discharges. The high‐lying Rydberg states could be of particular significance since, (i) their production efficiencies are high, and (ii) they have comparatively long lifetimes. Such states could be populated in discharge sources via direct electron impact or via excitation transfer from metastable states of inert gases.
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