High accuracy computed water line list - BT2

The list, BT2 was produced using a discrete variable representation two-step approach for solving the rotation-vibration nuclear motions. It is the most complete water line list in existence, comprising over 500 million transitions (65% more than any other list) and is also the most accurate (over 90% of all experimental levels are within 0.3cm^-1^ of the BT2 values).

Its accuracy has been confirmed by extensive testing against astronomical and laboratory data. The line list has been used to identify water lines in a variety of objects including: comets, sunspots, a brown dwarf and the nova-like object V838 Mon. Comparison of the observed intensities with those generated by BT2 enables physical values to be derived for these objects.