Photochemistry of Lanthanide Ions-Multiphoton Chemistry via 4f Electronic Excited States-

在激光作用下，乙醇中的Yb3+离子被分次双色双光子激发还原为相应的2+离子，脉宽为4 ns的红外脉冲通过2F5/2-2F7/2跃迁将基态泵浦到4f激发态，第二光子(355 Nm)产生Cl3d到Yb4f的电荷转移(CT)态，还原发生。激光能量对每种颜色的紫外光和红外光以及红外光波长的依赖性说明了上述机理。用纳秒激光光解测量了双光子化学中从4f激发态(2F5/2)到CT态的中间吸收光谱，中间光谱出现在小于400 nm的波长内，单光子紫外光激发和双光子激发中的第二光子的反应产率为0.1-0.2。这些化学物质有望用于清洁废物的处理。

Ytterbium 3+ ions in alcohol were found to be reduced to the corresponding 2+ ions upon laser irradiation with a stepwise two-color two-photon excitation.The infrared (975-nm) pulse with a duration of 4 ns pumps the ground state to the 4f excited state with the transition of 2F5/2-2F7/2, and the second photon (355-nm) generates the charge transfer(CT)state of Cl3d to Yb4f;the reduction then occurs. Laser energy dependencies on each color of UV and IR, and on IR wavelengths demonstrate the above mechanism. The intermediate absorption spectrum in the two-photon chemistry was measured from the 4f excited state (2F5/2) to the CT state by nanosecond laser photolysis.The intermediate spectrum appears in the wavelengths shorter than 400 nm.The reaction yields for single- photon UV excitation and the second photon in the two-photon excitation were 0.1-0.2. These chemistries are hopefully useful for nclear waste treatment.