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We present an experimental instrument that performs laboratory-basedgas-phase Terahertz Desorption Emission Spectroscopy (THz-DES) experiments insupport of astrochemistry. The measurement system combines a terahertzheterodyne radiometer that uses room temperature semiconductor mixer diodetechnology previously developed for the purposes of Earth observation, with ahigh-vacuum desorption gas cell and high-speed digital sampling circuitry toenable high spectral and temporal resolution spectroscopy of molecular specieswith thermal discrimination. During use, molecules are condensed onto a liquidnitrogen cooled metal finger to emulate ice structures that may be present inspace. Following deposition, thermal desorption is controlled and initiated bymeans of a heater and monitored via a temperature sensor. The 'rest frequency'spectral signatures of molecules released into the vacuum cell environment aredetected by the heterodyne radiometer in real-time and characterised with highspectral resolution. To demonstrate the viability of the instrument, we havestudied Nitrous Oxide (N2O). This molecule strongly emits within the terahertz(sub-millimetre wavelength) range and provide a suitable test gas and wecompare the results obtained with more traditional techniques such asquadrupole mass spectrometry. The results obtained allow us to fullycharacterize the measurement method and we discuss its potential use as alaboratory tool in support of astrochemical observations of molecular speciesin the interstellar medium and the Solar System.

TeraHertz Desorption Emission Spectroscopy (THz DES) of space relevant ices