论文标题
SI II，C II，Fe I和Ni II的参考波长
Reference wavelengths of Si II, C II, Fe I, and Ni II
论文作者
论文摘要
星系光谱中的吸收线波长沿远距离的类星体可以使用高红移的良好结构常数（$α$）的可变性，前提是实验室波长在10 $^8 $中已知比6份的6个部分，相当于$^8 $的6个部分，该零件对应于$^$ $ $ $ $ \ $ $ \ ys $^$^20 ms。对于SI II，C II，Fe I和Ni II的几行，以前发表的波长是为此目的不足的。通过重新分析铁空阴极灯（HCL）和碳化硅碳化物笔排放灯的档案傅立叶变换（FT）光谱来得出这些线的改善波长，并带有新的镍HCl光谱。通过重新提高Fe I的能量水平，将13个共振线的绝对不确定性降低了2倍以上。对Si II的类似分析可为45行的值提高，该值在比以前的测量值小的情况下，具有波长不确定性的45行。测量了8行Ni II的波长，并从优化的能量水平从较短波长处确定的3条线确定了ritz波长。使用FT光谱法观察到了三条C II在135〜nm附近的线，而波长则确认了先前的测量值。
Wavelengths of absorption lines in the spectra of galaxies along the line-of-sight to distant quasars can be used to probe the variablility of the fine structure constant, $α$, at high redshifts, provided that the laboratory wavelengths are known to better than 6 parts in 10$^8$, corresponding to a radial velocity of $\approx$~20 ms$^{-1}$. For several lines of Si II, C II, Fe I, and Ni II, previously published wavelengths are inadequate for this purpose. Improved wavelengths for these lines were derived by re-analyzing archival Fourier transform (FT) spectra of iron hollow cathode lamps (HCL) and a silicon carbide Penning discharge lamp, and with new spectra of nickel HCLs. By re-optimizing the energy levels of Fe I, the absolute uncertainty of 13 resonance lines has been reduced by over a factor of 2. A similar analysis for Si II gives improved values for 45 lines with wavelength uncertainties over an order of magnitude smaller than previous measurements. Improved wavelengths for 8 lines of Ni II were measured and Ritz wavelengths from optimized energy levels determined for an additional 3 lines at shorter wavelengths. Three lines of C II near 135~nm were observed using FT spectroscopy and the wavelengths confirm previous measurements.
