Singlet–triplet absorption spectra of some aromatic molecules in gas matrices at 10 K
Abstract
Singlet–triplet transitions of some aromatic compounds have been investigated in oxygen matrices at 10 K. The technique developed in this study circumvents experimental difficulties of the classical high pressure technique of oxygen perturbation. It also overcomes the problem of estimating an accurate profile for the contact charge–transfer spectrum in the subtraction procedure by its actual measurement during the experiment. Vibrational progressions are not always lost for the studied aromatic compounds at the temperature employed and the data obtained for toluene at low temperatures may be used to add further support to recent interpretations of non-radiative rate constant data. Xenon matrix experiments indicated that the “heavy atom” effect of the gas is insufficient to produce perturbed singlet–triplet spectra at 10 K.
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