晶体中正交、单斜和三斜对称位置上过渡离子的自然界自我强加的限制和内在不可比晶体（配体）场参数集的存在：陷阱和祝福
Nature self-imposed limits and existence of intrinsically incomparable crystal (ligand) field parameter sets for transition ions at orthorhombic, monoclinic, and triclinic symmetry sites in crystals: pitfalls and blessings
摘要：
晶体中过渡态离子光谱学和磁性的中心量是晶体场参数。阐明了自然界对正交和低对称CFP的自我限制，以及本质上不可比的CFP集的存在。这样的CFP集的比较导致有争议的索赔，不正确的结构结论或CFP系统学，和光谱数据的误解。在文献中相当程度的这种陷阱表明，许多研究人员仍然没有意识到的内在特征的低对称性CFPs。这就要求采取协调一致的补救行动。为了避免陷阱，比较方法的基础上标准化的菱形比表示CFP集在同一区域的CF参数空间。在多重相关拟合技术中更广泛地利用替代CFP集，以提高最终拟合CFP的可靠性（祝福）。这篇评论可能对研究各种材料的物理学家和化学家以及科学历史学家和哲学家感兴趣。
英文摘要：
Central quantities in spectroscopy and magnetism of transition ions in crystals are crystal field parameters (CFPs). Nature self-imposed limits on orthorhombic and lower symmetry CFPs, and existence of intrinsically incomparable CFP sets are elucidated. Comparisons of such CFP sets result in controversial claims, incorrect structural conclusions or CFP systematics, and misinterpretation of spectroscopic data. Considerable extent of such pitfalls in literature indicates many researchers remain unaware of the intrinsic features of low symmetry CFPs. This calls for coordinated remedial actions. To avoid pitfalls, comparative methodology based on standardization of the rhombicity ratio to express CFP sets in the same region of CF parameter space is proposed. Wider utilization of alternative CFP sets in the multiple correlated fitting technique to improve reliability (blessings) of final fitted CFPs is advocated. This review may be of interest to physicists and chemists working on various materials as well as to science historians and philosophers.
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