Experimental radiative lifetimes for highly excited states and calculated oscillator strengths for lines of astrophysical interest in singly ionized cobalt (Co II)
P. Quinet, V. Fivet, P. Palmeri, L. Engstrom, H. Hartman, H. Lundberg, H. Nilsson
这项工作报告了新的实验辐射寿命和计算的振荡器强度的天体物理学的兴趣在单电离钴的过渡。更准确地说，十九辐射寿命在Co+已测量的时间分辨激光诱导荧光技术，使用一步和两步激发。其中，7个属于高位3d $^7$（$^4$ F）4d组态，能量范围为90697 - 93738 cm $^{-1}$，其他12个来自th 3d $^7$（$^4$ F）4p组态，能量范围为45972 - 49328 cm $^{-1}$ 1，与以前的测量进行了比较。此外，我们还采用了考虑核极化效应的相对论Hartree-Fock模型计算了跃迁率。在理论与实验的良好一致性的支持下，我们得到了114 - 8744 nm范围内5080 Co Ⅱ跃迁的跃迁几率和振子强度。
英文摘要：
This work reports new experimental radiative lifetimes and calculated oscillator strengths for transitions of astrophysical interest in singly ionized cobalt. More precisely, nineteen radiative lifetimes in Co+ have been measured with the time-resolved laser-induced fluorescence technique using one- and two-step excitations. Out of these, seven belonging to the high lying 3d$^7$($^4$F)4d configuration in the energy range 90697 - 93738 cm$^{-1}$ are new, and the other twelve from th3d$^7$($^4$F)F)4p configuration with energies between 45972 and 49328 cm$^{-1}$1 are compared with previous measurements. In addition, a relativistic Hartree-Fock model including core-polarization effects has been employed to compute transition rates. Supported by the good agreement between theory and experiment for the lifetimes, new reliable transition probabilities and oscillator strengths have been deduced for 5080 Co II transitions in the spectral range 114 - 8744 nm.
威斯康星等离子体天体物理实验室（WiPAL）是一个灵活的用户设施，旨在研究一系列与天体物理学相关的等离子体过程以及模拟天体物理系统的新几何形状。由强钐钴永磁体构造的多尖磁桶现在限制10 m $^3$，完全电离，磁场自由等离子体在球形几何形状。等离子体参数$ T_{e}\approx5$到$20$ eV和$n_{e}\approx10^{11}$到$5\times10^{12}$ cm $^{-3}$为一系列天体物理实验提供了理想的测试平台，这些实验包括自激发电机、无碰撞磁重联、喷流稳定性、恒星风等。本文描述了WiPAL的功能以及在操作和规划阶段的几个实验，为未来用户展示了各种可能性。
