Abstract
A pulsed, tunable dye-laser initiates an optogalvanic spectrum of OH between 3074 and 3098Å. The OH is in a hollow cathode discharge that originates from a mixture of Ne and ⩽0.6% H 2O. Data analysis indicates that the ground ( X) electronic state of OH has a rotational temperature of ≈250–300 K. This method appears to be a good diagnostic for the X state in discharges.
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