最近对基于单个捕获的$^{43}$ Ca $^+$离子的光频率标准预期的频率不确定度的评估发表在Phys. Rev. A { \bf 72}(2005)043404中。该论文包含了一些有趣的信息,如系统频率偏移,但未能描述其不确定性,导致混淆准确性和精度。关于对频移的主要贡献的结论与所提出的计算不一致,并且省略了与先前公布的数据的比较。
英文摘要:
A recent evaluation of the frequency uncertainty expected for an optical frequency standard based on a single trapped $^{43}$Ca$^+$ ion was published in Phys. Rev. A {\bf 72} (2005) 043404. The paper contains some interesting information like systematic frequency shifts but fails to depict their uncertainty, leading to confuse accuracy and precision. The conclusions about the major contribution to the frequency shift are not consistent with the presented calculations and omit comparisons with data published previously.
Comment on "Electron impact excitation and ionization cross section of tungsten ions, W$^{44+}$" by El-Maaref et al. [J. Quant. Spectrosc. Radiat. Transfer 2019, 224:147]
在最近的一篇论文中,El-Maaref等人[J. Quant.光谱Radiat. Transfer 2019,224:147]已经报道了类Zn W-XLV的原子数据。他们的结果主要是能级,辐射率,碰撞强度($Ω$)的电子碰撞激发,和电离的截面,但只有几个级别/过渡,在一个非常有限的能量范围。对于$Ω$的计算,他们采用了DARC代码。在这篇评论中,通过我们独立的计算,我们证明了他们的结果为$Ω$被高度低估了两个数量级以上,因此是完全不可靠的。
Comment on "Measurement of a large Chemical Reaction Rate between Ultracold Closed-Shell ^{40}Ca Atoms and Open-Shell ^{174}Yb^{+} Ions Held in a Hybrid Atom-Ion Trap"
我们估算了$^{40}$ Ca - $^{174}$ Yb $^{+}$分子离子的辐射猝灭率,发现它低估了最近实验中报道的数值约5个数量级。我们对这一巨大差异的可能解释发表评论。