The Journal of Physical and Chemical Reference Data (JPCRD) has historically limited its scope to critical evaluations of existing data in a field, producing recommendations for the best available physical and chemical property data, preferably withuncertainty analysis. In early 2018, the scopewas expanded to include Review Articles, which might describe and document a reference database, review the data situation in a particular field, provide an overview of a series of JPCRD articles, review reference-quality measurement techniques, or review data evaluation methods. JPCRD has excluded from its scope original experimental or theoretical work, such as that found in the primary research literature; the only exception is when the experimental or theoretical results are needed to fill a “gap” in the input data for a paper whose fundamental purpose is producing critically evaluated correlations or recommended data. We are now expanding this scope slightly. While most experimental measurements and theory will still be out of scope, we will publish experimental or theoretical work if—in the judgment of the Editors—it provides definitive “reference data.” By this, we mean data that are clearly the most accurate possible (with small and well-documented uncertainties) and that provide a state-of-the-art standard that is expected to last for many years. Especially welcome are data that can serve as a reference for purposes outside their immediate context, such as calibration of instruments. Examples of past work that could fit in this category include the experiments that established the 0.01 K difference between the ice point and the triple point of water (thus setting 273.15 K as the zero of theCelsius scale), the careful determination of the absolute viscosity of liquid water that has served as a calibration standard for decades, the accurate absolute determination of the dipole moment of the OCS molecule that is a reference for spectroscopic determination of dipolemoments,measurements or calculations that establish the energies of key molecules or ions with subchemical accuracy for use in a thermochemical network to provide self-consistent energies for related compounds, and the ab initio computation of low-density thermophysical properties of helium for use in calibrations and metrology. As always, authorswith questions about the suitability of an article for JPCRD are encouraged to contact either of the Editors.

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（轻微）扩大 JPCRD 的范围

物理和化学参考数据杂志 (JPCRD) 历来将其范围限制在对某一领域现有数据的批判性评估，为最佳可用的物理和化学性质数据提供建议，最好进行不确定性分析。在 2018 年初，范围扩大到包括评论文章，它可能描述和记录参考数据库、审查特定领域的数据情况、提供一系列 JPCRD 文章的概述、审查参考质量测量技术或审查数据评价方法。JPCRD 已将原始实验或理论工作排除在其范围之外，例如在主要研究文献中发现的；唯一的例外是当需要实验或理论结果来填补输入数据中的“空白”时，论文的基本目的是产生批判性评估的相关性或推荐数据。我们现在正在稍微扩大这个范围。虽然大多数实验测量和理论仍然超出范围，但如果根据编辑的判断，我们将发布实验或理论工作，如果它提供了明确的“参考数据”。在这里，我们的意思是数据显然是最准确的（具有小的和有据可查的不确定性），并且提供了预计将持续多年的最先进的标准。特别受欢迎的是可以作为其直接上下文之外目的的参考的数据，例如仪器校准。过去适合这一类别的工作示例包括确定冰点和水三相点之间 0.01 K 差异的实验（因此将 273.15 K 设为摄氏标度的零），仔细确定水的绝对粘度几十年来一直作为校准标准的液态水，OCS 分子偶极矩的准确绝对测定，是光谱测定偶极矩的参考，测量或计算以亚化学精度建立关键分子或离子的能量在热化学网络中使用，为相关化合物提供自洽能量，以及用于校准和计量的氦的低密度热物理特性的从头计算。一如既往，