Data schema overview¶

Info

The schema of the data used in ASDCache in principle reflects that of the NIST ASD Line Table, using the tab-separated format. You can find the relevant information on the included data on this page of the NIST ASD documentation.

Column name	Data type	Description	Note
`element`	`str`	atomic element
`sp_num`	`int`	ionization degree, starting with 1 for the unionized atom	Only integers, not roman numerals
`obs_wl_vac(nm)`	`float`	Observed vacuum wavelength
`unc_obs_wl`	`float`	Uncertainty in observed vacuum wavelength
`obs_wl_air(nm)`	`float`	Observed wavelength in air	Calculated from `obs_wl_vac(nm)`, not retrieved from ASD
`ritz_wl_vac(nm)`	`float`	Ritz wavelength in vacuum
`unc_ritz_wl`	`float`	Uncertainty in Ritz wavelength
`ritz_wl_air(nm)`	`float`	Ritz wavelength in air	Calculated from `ritz_wl_vac(nm)`, not retrieved from ASD
`wn(cm-1)`	`float`	Observed wavenumbers
`intens`	`float`	Guideline for strenght of a line in an emission spectrum	Also known as 'Rel. Intens.' in the HTML table. Does not include any of the footnotes available in the ASD.
`Aki(s^-1)`	`float`	Einstein A coefficient of transition
`fik`	`float`	Absorption oscillator strength
`S(a.u.)`	`float`	Line strenght
`log_gf`	`float`	$\log_{10}\ g_{i}f_{ik}$
`Acc`	`str`	Estimated accuracy of transition strength
`Ei(cm-1)`	`float`	Lower state energy
`Ek(cm-1)`	`float`	Upper state energy
`conf_i`	`str`	Lower state configuration
`term_i`	`str`	Lower state term symbol
`J_i`	`str`	Lower state total electronic angular momentum
`conf_k`	`str`	Upper state configuration
`term_k`	`str`	Upper state term symbol
`J_k`	`str`	Upper state total electronic angular momentum
`g_i`	`float`	Lower Landé $g$ factor
`g_k`	`float`	Upper Landé $g$ factor
`Type`	`str`	The type of transition	Allowed electric-dipole transitions are explicitly labeled as `E1`
`tp_ref`	`str`	Atomic Transition Probability Bibliographic Database Reference
`line_ref`	`str`	Energy Levels and Wavelengths Bibliographic Reference