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Ch. Ottinger, T. Winkler

Spectrally Resolved Phosphorescence and Slow Fluorescence from Selected Vibronic Levels of Jet-Cooled Glyoxal

Trans-glyoxal molecules in a seeded pulsed jet were laser-excited into selected vibrational levels of the T₁ and S₁ states. In the latter case, those specific rovibrational levels were chosen which exhibit S₁/T₁ gateway coupling. In each case, the long-lived emission into the S₀ state was observed employing a spectrograph/CCD combination, covering 5000 cm^-1 at 60 cm^-1 FWHM resolution. A model Franck–Condon calculation of the relative ν₅ band intensities demonstrates the structural similarities of the S₁ and T₁ states. However, there are some distinct differences, despite the almost identical S₁ and T₁ vibrational frequencies. The S₁← S₀ excitation distorts the molecule significantly more in the ν₅ dimension than does T₁← S₀.

Zeitschrift für Physikalische Chemie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0942-9352
Volume: 215, 03/2001
Pages: 319

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