1. Select the Lines tab from the main menu.


2. Enter the Element from the periodic table in the top box.


3. Enter the starting and ending wavelength values in ångstrom in the boxes below to search for line transitions of this chemical element. The BRASS database will return data values for spectral lines of neutral atoms and ions of the element. Please keep your wavelength range queries limited to at most a few hundred ångstroms to avoid loading massive amounts of atomic data at once in the BRASS Lines Interface. Very large queries can delay the BRASS Data Server and decrease its response times for other users.


4. Select the plot button in case you would like to view a plot comparing the log(gf) values from various sources searched in BRASS.


5. Select the wavelength radio button.


6. Press the Search lines button below and wait 10 to 30 seconds depending on the number of line transitions in the requested wavelength range.





The query will show a multi-panel plot on the screen:






The plot shows the differences between the BRASS log(gf) values and other atomic data sources for lines of neutral atoms, singly ionized atoms, and of doubly ionized and higher ions. The subpanels provide an overview of the cross-matched atomic line data values provided in BRASS for each of the searched atomic data sources and species.




Each datapoint in the subpanels can be queried by hovering with the mouse over the datapoint. This shows the values of the BRASS log(gf) value of the datapoint against the log(gf) difference between BRASS and other atomic data sources as marked on the y-axis.