利用1064nm Nd:YAG激光器研究了激光诱导铁条等离子体的特征参数。为了减小测量误差和谱线自发辐射跃迁几率不确定性带来的计算误差,采用改进的迭代Boltzmann方法精确求解铁等离子体的电子温度为8058K。Lorentz函数拟合Fe I 376.553nm得到等离子体的电子数密度为8.7×1017 cm-3。分析表明等离子体的加热机制主要是逆轫致过程,其吸收系数是0.14cm-1。实验数据证实激光诱导铁等离子体处于局部热力学平衡状态和光学薄状态。
Four europium trifiuoroacetate complexes, Eu（CF3COO）3＂bpy（bpy=2,2＇-bipyridine）（l）, Eu（CF3COO）3＂ phen（phen=l,10-phenanthroline）（2）, Eu（CF3COO）3.2bp（bp=benzophenone）（3） and Eu（CF3COO）3-2tppo（tppo=triphenyl- phosphine oxide）（4） were synthesized and characterized by elemental analysis, Fourier transform infrared（FTIR） spectroscopy, photoluminescence（PL） spectroscopy and thermogravimetric analysis（TGA）. The PL spectra of the complexes at room temperature show the strong typical Eu3＋ ion red emission, due to the efficient energy ＂antenna absorption＂ of ligands and transitions of Eu3＋ ion between 5Do----7Fj（j-0-4）. The long lifetime and high quantum yield reflect that the multiphonon relaxations by coupling to O--H and C--H vibrations were reduced. According to the photoluminescent spectra, the Judd-Ofelt parameters f22 and 04 of the complexes were calculated and the radiative properties were also presented. The 5D0 radiative lifetime, quantum yield and the stimulated emission cross-section of the complexes are excellent, which prove that they have promising optical properties for liquid laser. The thermal analyses indicate that they are quite stable to heat.
SHE Jiang-boLI Dong-dongGAO FeiQIAO Ze-bangLIU Huan-huanWEI WeiPENG Bo
