This page describes the Spectral Line lists that will be used for Offline CASA

ALMA has a high level requirement that all user software must be able to run in an offline mode. To that end, a spectral line table is needed for CASA. The full power of Splatalogue will be available for online use. The overarching goals were the following: (a) keep the offline list at a manageable size; (b) have a list that is easy to maintain; (c) create the list from Splatalogue in such a way that users can easily make there own personal line lists.

The files described below were downloaded from on 08/25/10 using tab separation (commas and & are used in the quantum numbers and therefore do not make good deliminators). To simplify maitenance of the spectral line lists we split them into three categories as defined below. If you know of a molecule/transition that you think should be added to the "Miscellaneous" list please contact Crystal Brogan.

  • Transitions from Known Astrophysical Molecules with NRAO Recommended Rest Frequencies (this list's name is shortened to "Known Molecules" below). The file can be downloaded from The current size is 30 MB, 456463 lines. There is a limit on the website download size which the full dump from 1 to 950 GB violates though the link above does go to the full list
    • Molecule has been observed in space (and published)
    • Transition must have an NRAO recommended frequency assigned (includes >95% of transitions that have been measured/predicted for known astronomical molecules).
    • Frequency range: 1 to 950 GHz (combined early science range of EVLA and ALMA)
    • E_lower (K) < 1500 K
    • Columns are:
      • 1) Species (chemical formula)
      • 2) Flag indicating it is an NRAO recommended rest frequency
      • 3) Name (chemical name)
      • 4) Rest Frequency (GHz) (This is the NRAO recommended frequency, in many cases alternative frequencies are availabe in other spectral line catalogs and the full list in Splatalogue, see for more information).
      • 5) Resolved Quantum Number (for more details see
      • 6) CDMS/JPL Intensity (not available for all species, evaluated at 300 K))
      • 7) Sijmu^2 (Debye, available for most (all?) molecular species)
      • 8) Log10(Aij) (Einstein A coefficient, available for most (all?) molecular species)
      • 9) E_lower (K)
      • 10) E_upper (K)
      • 11) Original spectral line catalog (see for references)
    • If this list proves to large to be manageable we may have to tighten the criteria further.

  • Radio Recombination Line List. The file can be downloaded from The current size is 0.36 MB, 2993 lines.
    • Columns are the same as the "known molecules list" except many are blank because they are not relevant (5-11). All recombination lines were calculated by Tony Remijan based on standard formulas. Except frequency, no other cuts were made.
    • All RRLs for Hydrogen, Helium, and Carbon that are in Splatalogue are included.

-- CrystalBrogan - 2010-08-23
Topic revision: r3 - 2010-09-09, CrystalBrogan
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