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

高强度激光对镧系离子的多光子还原和同位素富集

• 批准号: 19350016
• 负责人: NAKASHIMA Nobuaki
• 金额: $ 12.56万
• 依托单位: Osaka City University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2007
• 资助国家: 日本
• 起止时间: 2007 至 2009
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19350016/
• 关键词: 多光子反応; 同位体分離; 反応制御; ランタニドイオン; 光還元反応; Sm; Yb; 溶媒和電子; Eu、Sm; フェムト秒パルス; 多光子還元; フェムト秒白色光; Eu,Sm; 多光子反応; 同位体分離; 反応制御; ランタニドイオン; 光還元反応; Sm; Yb; 溶媒和電子; Eu、Sm; フェムト秒パルス; 多光子還元; フェムト秒白色光; Eu,Sm

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

Eu^<3+>→Eu^<2+>还原甲醇中的3+离子在辐照后用强烈的飞秒激光脉冲辐射后将其还原为相应的2+离子。 800 nm的兴奋波长与Eu^<3+>的电子跃迁是非共振的。值得注意的是，当反应发生时会产生飞秒的白光激光器。该机制可以用解决的电子形成，然后还原。已知溶液中聚焦光束中的电子射精伴随着白光激光。SM^<3+>→SM^<2+>还原甲醇中的氨基3+离子在辐照后用强烈的flestosecond lasecond Laser脉冲降低到相应的2+离子。在两个脉冲上观察到降低，中心波长为403 nm，从800-FS基本脉冲转化为800 nm，持续时间为43 fs。当激光波长在403 nm处调谐到4F-4F抽象时，对应于 ^6p_ <3/3/2>← ^6H_ <5/5/2> transitio…更多n，降低可能是由多霍顿抽象发生的，大概是由于达到了深度电荷传递状态。在Ti：Sapphire Laser的基本波长的800 nm脉冲兴奋的情况下，认为还原是通过溶剂电离发生的，然后通过SM^<3+>捕获电子。通过其荧光检测到Sm^<2+>，在溶液中首次观察到，在15c5- erth的存在下，甲醇的量子率为0.050，在溶液中观察到了较大的频谱峰，量子富含甲醇的摩尔延伸系数^6p_ <3/3/2> <3/3/2>^6H_ <5/2> <5/2> <5/10％<3> 10％ ^<154> SM^<3+>在解决方案中：因此，在多光子从SM^<3+>还原为Sm^<2+>后，应实现samarium 2+离子之间的不同同位素分布。该确认目前正在进行中。Yb^<3+>→Yb^<2+>反应YB^<3+>的首要结果已通过Femtsecond脉冲兴奋成功地降低至Yb^<2+>，脉冲持续时间约为100 fs，在三个波长为800 nm，970 nm，970 nm和1930 nm的情况下约为100 fs。 Yb^<3+>在970 nm处具有4F-4F过渡；但是，在此阶段尚不清楚Yb^<2+>形成的共振增强。较少的