Abstract
Processes of stepwise ionization of hydroquinone vapor by radiation in the range 315–275 nm were studied using photoionization spectroscopy techniques. The two-step ionization process yielding molecular ions was found to prevail at a laser power density up to ∼107 W/cm2. As the radiation intensity increases, the progressively stronger and deeper degradation takes place via dissociation of the molecular and, probably, fragment ions due to absorption of at least one additional photon. The slow process of the formation of C5H6O0 ions at an effective rate constant of the order of 106 s−1 was observed.
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