Accurate laboratory wavelengths of some ultraviolet lines of Cr, Zn and Ni relevant to time variations of the fine structure constant
Accurate laboratory wavelengths of some ultraviolet lines of Cr, Zn and Ni relevant to time variations of the fine structure constant
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Cr、Zn 和 Ni 的一些紫外线的准确实验室波长与精细结构常数的时间变化相关
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
J. Webb
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文献类型：
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作者：
J. Pickering;A. Thorne;J. Murray;U. Litzén;S. Johansson;V. Zilio;J. Webb
现在可用的天文光谱数据的质量非常高，以至于解释和分析常常受到实验室数据库的不确定性的限制。特别是，使用类星体光谱限制精细结构常数 α 的时空变化的极限取决于更准确的实验室休息波长的可用性。为此，我们最近通过高分辨率傅立叶变换光谱测量了镁中的一些跃迁，现在我们报告了对 Zn ii（2062 和 2026 A）、Cr ii（2066、2062 和 2056 A）和 Ni ii（1751、1741、1709 和 1703 A）的一些紫外共振线的测量。除了非常弱的最后一条线外，这些测量的不确定性对于 2000 A 附近的线为 0.002 cm−1 (0.08 ma)，对于 1700 A 附近的线为 0.004 cm−1 (0.12 ma)。
The quality of astronomical spectroscopic data now available is so high that interpretation and analysis are often limited by the uncertainties of the laboratory data base. In particular, the limit with which space–time variations in the fine structure constant α can be constrained using quasar spectra depends on the availability of more accurate laboratory rest wavelengths. We recently measured some transitions in magnesium by high-resolution Fourier transform spectroscopy for this purpose, and we now report measurements on some ultraviolet resonance lines of Zn ii (2062 and 2026 A), Cr ii (2066, 2062 and 2056 A) and Ni ii (1751, 1741, 1709 and 1703 A). Apart from the last line, which is very weak, the uncertainty of these measurements is 0.002 cm−1 (0.08 ma) for the lines around 2000 A and 0.004 cm−1 (0.12 ma) for the lines around 1700 A.