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VACUUM ULTRAVIOLET RESONANCE ABSORPTION f-VALUES FOR Ni Ⅱ

机译:NiⅡ的真空紫外共振吸收f值

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摘要

We have used the High Sensitivity Absorption Spectroscopy experiment at the Synchrotron Radiation Center in Stoughton, Wisconsin, to measure relative absorption oscillator strengths, or f-values, for six resonance transitions of Ni~+ in the vacuum ultraviolet. This laboratory absorption work is an extension of recent laser induced fluorescence and emission work which established an accurate, absolute scale for Ni Ⅱ resonance f-values. The relative absorption f-values are normalized using three absolute f-values for Ni Ⅱ, previously determined by combining experimental radiative lifetimes and emission branching fractions, to produce an expanded set of seven absolute resonance f-values for Ni Ⅱ. Accurate f-values for Ni Ⅱ resonance lines are critical to the analysis of spectra on the diffuse interstellar medium and are used to determine various properties of the ISM. Resonance lines of Ni Ⅱ are also observed in high redshift QSO absorption line systems.
机译:我们已经在威斯康星州斯托顿的同步加速器辐射中心进行了高灵敏度吸收光谱实验,以测量真空紫外线中Ni〜+的六个共振跃迁的相对吸收振荡器强度或f值。实验室吸收工作是对最近的激光诱导的荧光和发射工作的扩展,该工作为NiⅡ共振f值建立了准确的绝对比例。使用先前通过结合实验辐射寿命和发射分支分数确定的三个NiⅡ绝对f值对相对吸收f值进行归一化,以生成一组扩展的NiⅡ七个绝对共振f值。 NiⅡ共振谱线的准确f值对于弥散星际介质上的光谱分析至关重要,可用于确定ISM的各种特性。在高红移QSO吸收线系统中也观察到NiⅡ的共振线。

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