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     The spectroscopic data may be selected and displayed according to wavelengths or energy levels by choosing one of the following options:
Spectral lines and associated energy levels displayed in wavelength order with all selected spectra intermixed or in multiplet order. Transition probabilities for the lines are also displayed where available.
Energy levels of a particular atom or ion displayed in order of energy above the ground state.

     The Atomic Spectra Database (ASD) contains data for radiative transitions and energy levels in atoms and atomic ions. Data are included for observed transitions of 99 elements and energy levels of 52 elements. ASD contains data on about 900 spectra from about 1 ? (?ngstr?ms) to 200 μm (micrometers), with about 70,000 energy levels and 91,000 lines, 40,000 of which have transition probabilities listed. The most current NIST-evaluated data associated with each transition are integrated under a single listing.

Summary by 何莉 on 2003-12-18

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