Multiphoton reduction of lanthanide ions and isotope enrichment by a high intensity laser

Eu^<3+>→Eu^<2+>还原发现在强飞秒激光脉冲照射下，甲醇中的铕3+离子被还原为相应的2+离子。激发波长为800 nm，与Eu^<3+>的电子跃迁不共振。值得注意的是，反应发生时产生了飞秒白光激光。其机理可以用溶剂化电子形成后的还原来解释。在溶液中，电子在聚焦光束中的射出是伴随着白光激光的。Sm^<3+>→Sm^<2+>还原甲醇中的钐3+离子在强飞秒激光脉冲照射下被还原为相应的2+离子。在中心波长为403 nm的脉冲和800 nm持续时间为43 fs的脉冲中都观察到这种减少。当激光波长调到403 nm处的4f-4f吸收时，对应于^6P_<3/2>←^6H_<5/2>的跃迁，更多n，多光子吸收发生了还原，可能是由于达到了深电荷转移态。在由基本波长为800 nm的Ti：蓝宝石激光器激发的情况下，认为还原是通过溶剂电离和Sm^<3+>的电子捕获发生的。产物Sm^<2+>的荧光检测是首次在溶液中观察到，在15c5 -醚存在的甲醇中，在750 nm左右出现了广谱峰，量子产率为0.050。同位素富集据报道，溶液中^6P_<3/2>←^6H_<5/2>跃迁的摩尔消光系数在^<144>Sm^<3+>和^<154>Sm^<3+>之间相差10%，因此，从Sm^<3+>到Sm^<2+>的多光子还原后，钐2+离子之间应该实现不同的同位素分布。此确认目前正在进行中。Yb^<3+>→Yb^<2+> ReactionYb^<3+>通过飞秒脉冲激发，在800 nm、970 nm和1930 nm三个波长下，脉冲持续时间约为100 fs，成功地还原为Yb^<2+>。Yb^<3+>在970 nm处发生4f-4f跃迁；然而，Yb^<2+>形成的共振增强在此阶段尚不清楚。少

Eu^<3+>→Eu^<2+> ReductionEuropium 3+ ions in methanol were found to be reduced to the corresponding 2+ ions upon irradiation with intense femtosecond laser pulses. The excitation wavelength of 800 nm was nonresonant with their electronic transitions of Eu^<3+>. It is notable that femtosecond white-light laser was generated when the reactions occurred. The mechanisms can be explained in terms of solvated electron formation followed by the reduction. The electron ejection in a focused beam in solution has been known to be accompanied by white-light laser.Sm^<3+>→Sm^<2+> ReductionSamarium 3+ ions in methanol were found to be reduced to the corresponding 2+ ions upon irradiation with intense femtosecond laser pulses. The reduction was observed at both pulses with central wavelengths of 403 nm converted from an 800-fs fundamental pulse and 800 nm with a duration of 43 fs. When the laser wavelength was tuned to the 4f-4f absorption at 403 nm corresponding to the ^6P_<3/2>←^6H_<5/2> transitio … More n, the the reduction occurred by multiphoton absorption presumably due to reaching the deep charge transfer state. In the case of excitation by 800-nm pulses of the fundamental wavelength of the Ti:sapphire laser, the reduction is considered to occur via solvent ionization followed by electron capture by Sm^<3+>. The product Sm^<2+> was detected by its fluorescence, which was observed for the first time in solution and showed a broad spectrum peak around 750 nm with a quantum yield of 0.050 in methanol in the presence of 15C5-ether.Isotope EnrichmentThe molar extinction coefficient of the ^6P_<3/2>←^6H_<5/2> transition is reportedly 10% different between ^<144>Sm^<3+> and ^<154>Sm^<3+> in solution : therefore, different isotope distributions among Samarium 2+ ions should be realized after the multiphoton reduction from Sm^<3+> to Sm^<2+>. This confirmation is currently in progress.Preliminary results for Yb^<3+>→Yb^<2+> ReactionYb^<3+> has successfully reduced to Yb^<2+> by femtosecond pulse excitation with pulse duration of about 100 fs at three wavelengths of 800 nm, 970 nm, and 1930 nm. Yb^<3+> has the 4f-4f transition at 970 nm ; however, resonance enhancement for the formation of Yb^<2+> was not clear at this stage. Less