Abstract
There are two-photon resonant transitions to H ∗ 2, from each of the four lowest rotational states of H 2, that lie within the bandwidth of the 193 nm ArF excimer emission. A third 193 nm photon can ionize from the H ∗ 2. A commercial excimer laser is used to generate 100–350 mJ pulse of narrow-band light. It can be tuned to each of the four transitions, so that large signals are generated, either (a) as ion current from gas, or (b) as an optogalvanic effect in a discharge. Determination of the rotational populations would provide a simple and sensitive method for localized analyses of the H 2 rotational temperature.
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