Abstract
Laser induced excitation spectra, A (π −1) ← X (π −1), of methyl, and trideuteromethyl, substituted diacetylene cations are reported. The well resolved vibrational structure is assigned to yield the frequencies of several of the totally symmetric fundamentals for the excited electronic state. These complement the values obtained for the ground cationic states from the corresponding emission spectra. The excitation spectra show that for these cations the radiative decay is apparent up to ≈0.4 eV internal energy in the A state in spite of the fact that fragment ions are also detected.
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