Triplet Lifetimes of Various Organic Molecules

The triplet lifetimes of various aromatic, carbonyl, and heterocyclic compounds are listed in Tables S.8A-3.8C. 

Many techniques are available for the determination of the geometry of organic molecules in their ground states, such as microwave spectroscopy, infrared and Raman spectroscopy, and electron and x-ray diffraction. 

Deteimined by phosphorescence decay at 77°K unless otherwise noted. Determined at - 190°C. 

However, one of the few sources of information regarding the configurations of molecules in their electronically excited states is electronic spectra. Consequently the excited state geometries of relatively few molecules are known to date. The most accurate method for the determination of excited 

State geometries involves analysis of the rotational fine structure of the electronic bands. Since the spectra of polyatomic molecules are complex, most analyses of this sort have been carried out on the triatomic or tetra-atomic molecules. For molecules whose spectra contain unresolved fine structure, estimates of the excited state geometry can be obtained by vibrational analyses. 

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