NIST Atomic Spectra Database
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The Atomic Spectra Database (ASD) contains data for radiative transitions and energy levels in atoms and atomic ions. Data are included for observed transitions and energy levels of most of the known chemical elements. ASD contains data on spectral lines with wavelengths from about 0.2 Å (ångströms) to 60 m (meters). For many lines, ASD includes radiative transition probabilities. The energy level data include the ground states and ionization energies for all spectra. Except where noted, the data have been critically evaluated by NIST. For most spectra, wavelengths, transition probabilities, relative intensities, and energy levels are integrated, so that all the available information for a given transition is incorporated under a single listing. For classified lines, in addition to the observed wavelength, ASD includes the Ritz wavelength, which is the wavelength derived from the energy levels. The Ritz wavelengths are usually more precise than the observed ones. Line lists containing classified lines can be ordered by either multiplet (for a given spectrum) or wavelength. For some spectra, ASD includes lists of prominent lines with wavelengths and relative intensities but without energy-level classifications.
原子光谱数据库(ASD)收录了原子及其离子中的辐射跃迁和能级数据。该数据库涵盖了已知大多数化学元素观测到的跃迁和能级信息。ASD包含从约0.2 Å(埃)至60 m(米)波长的光谱线数据。对于许多光谱线,ASD还提供了辐射跃迁概率。能级数据包括所有光谱的基态和电离能。除非特别说明,所有数据均经美国国家标准与技术研究院(NIST)严格评估。对于大多数光谱,波长、跃迁概率、相对强度和能级信息均已综合,确保了针对特定跃迁的所有可用信息均包含在单个条目中。对于分类光谱线,除了观测到的波长外,ASD还包括里茨波长,即从能级推导出的波长,通常比观测波长更为精确。包含分类光谱线的谱线列表可按多重谱(针对特定光谱)或波长进行排序。对于某些光谱,ASD还包括了具有波长和相对强度的显著光谱线列表,但不包含能级分类。

- NIST Atomic Spectra Database首次发布,提供了原子光谱数据的基础版本,为科学研究和工程应用奠定了基础。
- 数据集进行了重大更新,增加了更多的原子光谱数据,并改进了数据的质量和准确性。
- NIST Atomic Spectra Database首次应用于天文学领域,帮助研究人员分析恒星和星系的光谱数据。
- 数据集再次更新,引入了新的数据处理算法,提高了数据查询和检索的效率。
- NIST Atomic Spectra Database被广泛应用于材料科学研究,帮助科学家分析和理解材料的电子结构。
- 数据集进行了全面升级,增加了对更多元素和同位素的支持,进一步扩展了其应用范围。



