  We present the development of a new astrochemical research tool HILTRAC, the
Highly Instrumented Low Temperature ReAction Chamber. The instrument is based
on a pulsed form of the CRESU (Cin\'etique de R\'eaction en \'Ecoulement
Supersonique Uniforme, meaning reaction kinetics in a uniform supersonic flow)
apparatus, with the aim of collecting kinetics and spectroscopic information on
gas phase chemical reactions important in interstellar space or planetary
atmospheres. We discuss the apparatus design and its flexibility, the
implementation of pulsed laser photolysis followed by laser induced
fluorescence (PLP-LIF), and the first implementation of direct infrared
frequency comb spectroscopy (DFCS) coupled to the uniform supersonic flow.
Achievable flow temperatures range from 32(3) - 111(9) K, characterising a
total of five Laval nozzles for use with N2 and Ar buffer gases by pressure
impact measurements. These results were further validated using LIF and DFCS
measurements of the CH radical and OCS, respectively. Spectroscopic constants
and linelists for OCS are reported for the 1001 band near $2890 - 2940 cm^{-1}$
for both $OC^{32}S$ and $OC^{34}S$, measured using DFCS. Additional peaks in
the spectrum are tentatively assigned to the OCS-Ar complex. The first reaction
rate coefficients for the CH + OCS reaction measured between 32(3) K and 58(5)
K are reported. The reaction rate coefficient at 32(3) K was measured to be
$3.9(4) \times 10^{10} cm^3 molecule^{-1} s^{-1}$ and the reaction was found to
exhibit no observable temperature dependence over this low temperature range.
