NIST Atomic Spectra Database

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 20 pm (picometers) 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. 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 wavelengths, ASD includes the Ritz wavelengths, which are the wavelengths derived from the energy levels.

原子光谱数据库（Atomic Spectra Database，ASD）收录了原子及原子离子的辐射跃迁与能级相关数据。该库涵盖绝大多数已知化学元素的已观测跃迁与能级数据。该库收录的光谱线数据波长范围约为20皮米（picometers，pm）至60米（meters，m）。针对多数光谱线，该库还提供辐射跃迁概率数据。其能级数据包含所有原子光谱的基态与电离能信息。针对多数原子光谱，其波长、跃迁概率、相对强度及能级数据均已整合，使得某一特定跃迁的所有可用信息均可在单一条目下完整收录。对于已分类的光谱线，除观测波长外，该库还提供里兹波长（Ritz wavelengths）——即通过能级推导得出的波长。

搜集汇总

背景与挑战

背景概述

NIST原子光谱数据库是一个权威的标准参考数据库，收录了原子和原子离子的辐射跃迁与能级数据，覆盖大多数已知化学元素。该数据库提供波长范围从20皮米到60米的光谱线信息，并包含跃迁概率等关键参数，数据经过NIST严格评估和定期更新。