Light LMCT excited states

The quantum yield for oxalate decomposition is relatively independent of pH for acidic solutions, in addition to being independent of temperature, concentration of reactants, and light intensity. The absorption of light by the uranyl oxalate system results in the generation of LMCT excited states. Such an absorption results in the formation of carbon dioxide and the reduced UC ion ... 

Parallel studies have been extensively devoted to the use of HPAs as photocatalysts in homogeneous systems [53]. In fact, absorption of light by the ground electronic state of the solubilized HPA produces an excited state HPA. The light absorption gives rise to a O M ligand-to-metal charge transfer (LMCT) in... 

As they are relatively cheap and are produced in the form of almost ultraviolet-transparent materials, rare-earth-doped zeolites have attracted growing interest as substitutes for more expensive phosphors which, applied in fluorescent lamps, should be able to efficiently convert UV into visible light. As shown by Borgmann et al. [92], Eu +-doped zeolite X excited with 254-nm radiation gave only weak emission. Additional insertion of molybdate caused absorption of UV radiation and subsequent transfer from the excited metalate LMCT state to the Eu + level increasing the quantum yield up to 7%. Upon thermal treatment at... 

---