Michael Witthoeft (UMCP, NASA/GSFC), Tim Kallman (NASA/GSFC),
Juan González (IVIC)
A new database for atomic data, the Universal Atomic Database (uaDB), is being hosted on the NASA HEASARC web page. The goal of the database is to store a wide variety of data types and support any data format. Data from multiple sources can be stored simultaneously allowing for comparisons to be performed.
The integrity of the data going into uaDB is paramount. The source publication reference for each dataset is required and, through the web page, the journal page to retrieve the paper is available as a link. So, after searching for data, you can download the paper with just a couple clicks. Also, data is entered into the database exactly as published. No unit conversion is performed and data can be stored in either tabulated or fitted forms.
Data is accessed through a simple search form. No element in the form is required, although at least one must be used. Below are three search examples.
- To get all data available for Fe19+, enter into the Ion String box any of Fe19+, Fe XX, or N-like Fe. Entering Fe or N-like will search for the entire isonuclear or isoelectronic sequence, respectively. See example; may take a couple seconds. Click on the GET button to see the data.
- You can restrict your search to one type of data using the Data Type drop down
menu. Furthermore, you can provide a range of data values to return. Since uaDB stores data in any unit, the web page will automatically perform unit conversion for you, so long as you provide a unit in the range boxes. Supported units are listed here. In this example, we search for wavelength data between 1 and 10 Ångströms.
- You can further limit retrieved data based on a number of parameters, such as
initial or final state. In this example, we want to find all wavelengths involving 1s 2p states. Note that all data whether configuration-averaged, term-averaged, or fully level-resolved will be searched.
uaDB is still a work in progress. Currently, only data in the xstar database has been entered, but we plan to include data from other widely used databases. We also want to add visualization tools which take advantage of how data is stored in the database; for example, see the Grid page. For further information about how to use uaDB or to see how it is structured, you can look at the User’s and Developer’s Guides on the Help page. If you have any questions or suggestions, please contact Michael Witthoeft (email address is also on the Help page).