Quantitative measurements of the luminescence spectra, decay times, and quantum yields of ruthenium(Il) cations of Z>3 symmetry containing 2,2'-bipyridine and substituted-bipyridine ligands have yielded energy-level splittings and radiative and radiationless decay constants for the states arising from the d7r*(a2) charge-transfer configuration. The derived radiative rate constants provide additional evidence for the state symmetry assignments previously proposed. Rapid thermal relaxation among emitting levels is observed and attributed to strong spin-orbit coupling tying the spins to the lattice. The polarization characteristics of the emitted radiation is predicted to be strongly temperature dependent. Detailed descriptions of the techniques for making the measurements are included. Extension of both the techniques and interpretations to other ions displaying charge-transfer luminescence is discussed.Recently a group theoretic coupling model was proposed to rationalize the measured decay times of the photoluminescences observed from the tns(2,2'-bipyridine)ruthenium(II)
The possibility of obtaining a high specific input energy in an electron-beam sustained discharge ignited in oxygen gas mixtures O 2 : Ar : CO (or H 2) at the total gas pressures of 10-100 Torr was experimentally demonstrated. The specific input energy per molecular component exceeded ∼6 kJ l −1 atm −1 (150 kJ mol −1) as a small amount of carbon monoxide was added into a gas mixture of oxygen and argon. It was theoretically demonstrated that one might expect to obtain a singlet delta oxygen yield of 25% exceeding its threshold value needed for an oxygen-iodine laser operation at room temperature, when maintaining a non-self-sustained discharge in oxygen gas mixtures with molecular additives CO, H 2 or D 2. The efficiency of singlet delta oxygen production can be as high as 40%.
This equation, adapted to the appropriate level scheme, was used to generate the plots of Figure 8.
References and Notes(1) Research supported by AFOSR(NC)-OAR, USAF Grant AFOSR-72-2207.(2) Abstracted from a dissertation by G. D. Hager submitted to the Graduate School of Washington State University in partial fulfillment of the requirements for the degree
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