Das Tapasi, Podpaly Yuri A, Reader Joseph, Gillaspy John D, Ralchenko Yuri
National Institute of Standards and Technology, Gaithersburg, MD 20899-8422, USA.
Eur J Phys. 2018;72. doi: 10.1140/epjd/e2018-90118-7.
Extreme ultraviolet spectra of highly charged tungsten ions were produced with an electron beam ion trap at the National Institute of Standards and Technology and recorded with a flat-field grazing-incidence spectrometer. The spectra were measured in the wavelength range 2.7-17.3 nm while the beam energy varied between 1.65 and 2.00 keV. At these energies, the ionization stages from Zr-like W to Se-like W ions were observed. Large-scale collisional-radiative modelling was used to identify the strong lines, including 15 new ones, which represent electric dipole = 4-4 transitions in these ions. While a good quantitative agreement between theoretical and experimental data was found for almost all ions, some of the tentatively identified wavelengths in W significantly disagree from all available calculations.
在美国国家标准与技术研究所，利用电子束离子阱产生了高电荷态钨离子的极紫外光谱，并用平场掠入射光谱仪进行记录。光谱在2.7 - 17.3纳米波长范围内测量，同时束流能量在1.65至2.00千电子伏特之间变化。在这些能量下，观测到了从类锆钨离子到类硒钨离子的电离阶段。采用大规模碰撞辐射模型来识别强线，包括15条新的强线，这些强线代表了这些离子中的电偶极跃迁。虽然几乎所有离子的理论数据与实验数据都有良好的定量一致性，但钨中一些初步确定的波长与所有现有计算结果存在显著差异。
