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High-resolution gas phase spectroscopy techniques in the microwave,millimeter-wave and terahertz spectral ranges can be used to study complexorganic molecules desorbed from interstellar ice analogues surface with a highsensitivity. High-resolution gas phase spectroscopy gives unambiguousinformation about the molecular composition, the molecular structure, andtransition frequencies needed for their detection by radio telescopes invarious interstellar and circumstellar environments. The results will be usefulnot only for interpreting astronomical spectra and understanding astrophysicalprocesses, but also for more general studies of gas-surface chemistry. Thispaper presents a new experimental approach based on a combination of achirped-pulse Fourier transform microwave spectrometer detection and a lowtemperature surface desorption experiment. The experimental set-up isbenchmarked on the desorption of ammonia ice detected by high-resolution gasphase microwave spectroscopy.

High-resolution gas phase spectroscopy of molecules desorbed from an ice surface: a proof-of-principle study