Quick Picker
CO v = 0 13CO v = 0
C17O C18O
CH3OH vt = 0 H2CO
HCN v = 0 HNC v = 0
H13CN v = 0 HC15N v = 0
DCN v = 0 HCO+ v = 0
H2O v = 0 HDO
SiO v = 0
    Telescope Bands:   Redshift: 
Energy Range:    Min     Max     EL (cm-1) EL (K)
Frequency Range: Frequency Unit:
Min     Max
Settings Name
Astronomical Filters
(Double click to unselect)
            Top 20 list
            Planetary Atmosphere
            Hot Cores
            Dark Clouds
            Diffuse Clouds
             Scan to Mobile Splat

Welcome to the “New” Splatalogue!

Over the past several years, there has been an active effort to improve the overall functionality and usability of Splatalogue. We are now offering new options to navigate the nearly 6 million spectral lines available via Splatalogue. The user community has suggested a simpler, more efficient way of searching for and obtaining the more common spectral line features from the radio to submillimeter wavelength.

This new Splatalogue Basic search page is now available and has several new and quick search features including:

Redshift Converter: Located in the center of the page, you can now enter your desired redshift and the appropiate frequency or wavelength conversion will be completed. Both the redshifted value and the rest frame value will be displayed under the Ordered column as labeled. If nothing is entered, the default redshift is set to 0.

Wavelength or Frequency Search: You can choose whether you would like to search by frequency or wavelength. The options range from Hz to THz for frequency and angstroms through meters for wavelength. Choose the best option from the drop down menu just beside the frequency search range.

The Quick Picker: Located on the far left. Popular species are included. Click on your favorite, hit search and the results will pop up. You can also limit the frequency by entering in your preferred frequency or wavelength range.

Search Bar: Located in the center of the page. Type in the name (or in some cases, the formula) of your favorite molecule and all species with that molecule name, including isotopologues of that species, will be displayed. Again, you can limit the frequency displayed by entering in your preferred frequency or wavelength range.

Telescope Band Search: Located at the center of the page. This feature allows users to search molecules by telescope bands of the GBT, Jansky VLA, and ALMA. Instead of limiting your search by typing in a specific frequency or wavelength range, you can choose your favorite telescope band of interest. NOTE: the current version only allows searching one band at a time!

Astronomical Filters: Located on the far right. This option allows you to limit your search to the species currently known within certain astronomical environments. Also available is the "Top 20 list" which is the same as in the ALMA OT. When selected, the Top 20 species will be displayed. You can also choose your own desired frequency or wavelength range here as well to limit the output.

Any questions, comments, suggestions or concerns about Splatalogue? We would love to hear from you! Please submit a Helpdesk ticket through the ALMA Science Portal. To reach the Helpdesk, head to the ALMA Science Portal at www.almascience.org and select your preferred ALMA Regional Center (ARC) on the map. You can then reach the Helpdesk by clicking on the link "Helpdesk" that is located on the left panel under "User Services at ARCs." You must first register with the ALMA Science Portal to submit a Helpdesk ticket (it's free!). Once you are registered, log in to the Helpdesk and submit a new ticket. A direct link to the Helpdesk has also been placed under "Navigate" in the top left menu of this page. Questions on Splatalogue should be submitted to the “Project Planning” department.

To return to the original Splatalogue homepage with all the original functionality, click on the "Advanced" tab at the top of the page. On the Advanced page, you will also find helpful links to the NRAO homepage, NAASC ALMA Science homepage, ALMA Science Portal, Helpdesk and SLAP interface. To return to the Basic page, click on the “Basic” tab at the top of the Advanced page.

Do not have full access to your computer? Splatalogue now has a mobile version for use on smartphones. This limited view gives selected Quick Picker molecules, allows a frequency range search and has access to all the astronomical filters of the basic search page. The display is limited to only the molecular name, formula, recommended NRAO rest frequency and the resolved quantum numbers for the selected interstellar molecule. The page can be accessed via the accompanying QR code at www.splatalogue.online or by going directly to www.splatalogue.online using your mobile device.

Trying to export at large file but can't seem to get all your records? While we have made every effort to circumvent the timeout issues associated with PHP, depending on the internet connection and your computer speed, you will often not be able to export any file off the Splatalogue homepage larger than about 25MB. The best thing to do is download your file in smaller parts and combine them later. If you are using linux, "cat" is a straightforward way to join separate files together. Again, if you need any help with exporting a large dataset, submit a Helpdesk ticket with Splatalogue through the ALMA Science Portal.

The Splatalogue is an attempt to collate, rationalize and extend existing spectroscopic resources for use by the astronomical community. Splatalogue is a transition-resolved compilation of the JPL, CDMS, Lovas/NIST, Frank Lovas' own Spectral Line Atlas of Interstellar Molecules (SLAIM), H, He and C recombination lines, data from the Toyama Microwave Atlas for spectroscopists and astronomers, data from Frank De Lucia's lab at The Ohio State University and and new 13C1-methyl formate data, provided by a group of spectroscopist working on internal rotors (which can be found under the "TopModel" Line List selection). Currently, Splatalogue contains over 5.8 million lines in 1038 individual entries. Open access starts with splatalogue v.1.0 at www.splatalogue.online.

The Splatalogue effort would not be possible without the efforts of laboratories all over the world. Specifically, you will notice in the last column of any search with Splatalogue, the "LineList" where the data originated. For these data, you will need to reference the following:

Specifically, we would like to give special thanks to H. S. P. Müller, Brian Drouin, John Pearson, Frank Lovas and Floris van der Tak for their continued help and support of this effort. Without their efforts and their input, Splatalogue would not be possible.

Other Resources for Molecular Spectroscopy