A spectroscopic-data researcher whose joint NIST handbook organizes spectral lines, atomic energy levels and transition probabilities. These linked tables let an observer connect a measured wavelength with possible atomic transitions. Recording the energy-level classification alongside a line makes the database useful for interpreting a spectrum, beyond simply listing bright wavelengths.[ref]
Handbook of Basic Atomic Spectroscopic Data by Jean E. Sansonetti and William C. Martin. Database authors; Strong-Line, Persistent-Line and Energy-Level Tables
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