  A rotation-vibration line list for the electronic ground state
($\tilde{X}^{1}A_{1}$) of SiH$_2$ is presented. The line list, named CATS, is
suitable for temperatures up to 2000 K and covers the wavenumber range 0 -
10,000 cm$^{-1}$(wavelengths $>1.0$ $\mu$m) for states with rotational
excitation up to $J=52$. Over 310 million transitions between 593 804 energy
levels have been computed variationally with a new empirically refined
potential energy surface, determined by refining to 75 empirical term values
with $J\leq 5$ and a newly computed high-level ab initio dipole moment surface.
This is the first, comprehensive high-temperature line list to be reported for
SiH$_2$ and it is expected to aid the study of silylene in plasma physics,
industrial processes and possible astronomical detection. Furthermore, we
investigate the phenomenon of rotational energy level clustering in the
spectrum of SiH$_2$. The CATS line list is available from the ExoMol database
(www.exomol.com) and the CDS database.
