  The ExoMol database aims to provide comprehensive molecular line lists for
exoplanetary and other hot atmospheres. The data are expanded by inclusion of
empirically derived line lists taken from the literature for a series of
diatomic molecules, namely CH, NH, OH, AlCl, AlF, OH$^+$, CaF, MgF, KF, NaF,
LiCl, LiF, MgH, TiH, CrH, FeH, C$_2$, CP, CN, CaH, and triplet N$_2$.
Generally, these line lists are constructed from measured spectra using a
combination of effective rotational Hamiltonian models for the line positions
and ab initio (transition) dipole moments to provide intensities. This work
results in the inclusion of 22 new molecules (36 new isotopologues) in the
ExoMol database.
