Two-color resonance photoionization of aromatic molecules in solid argon

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Abstract
High pressure mercury arc photolysis of argon matrix samples of biphenyl, naphthalene, and 1‐phenyl‐1‐propyne containing CCl4 for an electron trap produced very strong parent radical cation absorptions. Filtered irradiations show that two‐color photoionization is responsible for ion formation in these experiments. In the case of biphenyl and naphthalene, photolysis data show that the relatively long‐lived S1 states are the intermediate in the two‐color photoionization process, whereas in the case of 1‐phenyl‐1‐propyne, the T1 state contributes to the two‐color photoionization process. The observation of two‐color photoionization in these experiments suggests that resonant absorption by an excited molecule into ionization is an extremely high cross‐section process.