Yield enhancement of elliptical high harmonics driven by bicircular laser pulses

We theoretically investigate the yield enhancement of elliptical high harmonics in the interaction of molecules with bicircular laser pulses by solving the time-dependent Schrödinger equation. It is shown that by adjusting the relative intensity ratio of the two bicircular field components in specific ranges the yield of the molecular high harmonics for the plateau and cutoff regions can be respectively enhanced. To analyze this enhancement phenomenon, we calculate the weights of the electron classical trajectories. Additionally, we also study the ellipticity distribution of harmonics for different intensity ratios. We find that these enhanced harmonics are elliptically polarized, which we mainly attribute to the recombination dipole moment of the major weighted trajectories. These enhanced elliptical extreme ultraviolet and soft x-ray radiations may serve as essential tools for exploring the ultrafast dynamics in magnetic materials and chiral media.     

柠檬酸燃烧法制备Sr_3Y_2(BO_3)_4:Eu~(3+)荧光粉及特性研究

以柠檬酸为络合物及助燃剂,使用简单的凝胶燃烧法,通过调整B2O3用量,制备出了不同含量Eu3+掺杂的Sr3 Y2(BO3)4基红光荧光粉。对所得样品进行了X射线衍射分析(XRD)、差热分析(DTA),扫描电镜分析(SEM)及荧光光谱分析(FDS)。分析结果显示,样品的烧结温度比固相法降低了100℃,且其粉体的分散性和颗粒度都得到了改善,并且得到Eu3+最佳的掺杂浓度为12mol%。     

壳聚糖包裹AgInS_2的物理表征及生物毒性研究

选用天然多糖中唯一的碱性多糖——壳聚糖作为稳定剂和包裹剂,成功合成了水溶性的Ag In S2量子点/低分子量壳聚糖纳米复合材料(Ag In S2/LCSMS)。利用透射电子显微镜(TEM)、FT-IR傅里叶红外光谱仪、紫外吸收光谱、荧光分光光度计等表征手段对纳米复合材料的形貌、化学组成及光学性质进行了研究。结果表明,Ag In S2/LCSMS纳米复合材料的粒径约为5~6 nm,在水相中仍具有较稳定的发光。之后,对Ag In S2/LCSMS纳米复合材料的生物相容性进行了研究,对比Ag In S2/LCSMS纳米复合材料与Ag In S2量子点的细胞活性测试结果发现,Ag In S2/LCSMS纳米复合材料的细胞活性比Ag In S2量子点有了明显的提高,说明通过低分子量壳聚糖的包裹可以明显提高纳米材料的生物相容性。因此,这类具有较好水溶性和生物相容性的荧光Ag In S2/LCSMS纳米复合材料可作为优良的生物荧光标记材料在生物医学检验、细胞以及活体成像研究中有广泛的应用前景。     

柠檬酸燃烧法制备Sr3Y2(BO3)4∶Eu3+荧光粉及特性研究

以柠檬酸为络合物及助燃剂,使用简单的凝胶燃烧法,通过调整B2O3用量,制备出了不同含量Eu3+掺杂的Sr3 Y2( BO3)4基红光荧光粉.对所得样品进行了X射线衍射分析(XRD)、差热分析(DTA),扫描电镜分析(SEM)及荧光光谱分析(FDS).分析结果显示,样品的烧结温度比固相法降低了100℃,且其粉体的分散性和颗粒度都得到了改善,并且得到Eu3+最佳的掺杂浓度为12mol;.