---
abstract: 'The ExoMol database (www.exomol.com) provides extensive line lists of molecular transitions which are valid over extended temperatures ranges. The status of the current release of the database is reviewed and a new data structure is specified. This structure augments the provision of energy levels (and hence transition frequencies) and Einstein $A$ coefficients with other key properties, including lifetimes of individual states, temperature-dependent cooling functions, Landé $g$-factors, partition functions, cross sections, $k$-coefficients and transition dipoles with phase relations. Particular attention is paid to the treatment of pressure broadening parameters. The new data structure includes a definition file which provides the necessary information for utilities accessing ExoMol through its application programming interface (API). Prospects for the inclusion of new species into the database are discussed.'
address: 'Department of Physics and Astronomy, University College London, London, WC1E 6BT, UK'
author:
- 'Jonathan Tennyson[^1]'
- 'Sergei N. Yurchenko'
- 'Ahmed F. Al-Refaie'
- 'Emma J. Barton'
- 'Katy L. Chubb'
- 'Phillip A. Coles'
- 'S. Diamantopoulou'
- 'Maire N. Gorman'
- Christian Hill
- 'Aden Z. Lam'
- Lorenzo Lodi
- 'Laura K. McKemmish'
- Yueqi Na
- Alec Owens
- 'Oleg L. Polyansky'
- 'Clara Sousa-Silva'
- 'Daniel S. Underwood'
