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Here, we detail the lower ice stage developed to generate ices at 4\u00a0K, which can then undergo energetic processing via UV\/VUV photons or high-energy electrons and which ultimately enter the gas phase via temperature-programmed desorption (TPD). Over the course of TPD, the lower ice stage is interfaced with a buffer gas cooling cell that allows for sensitive detection via chirped-pulse rotational spectroscopy in the 60\u201390\u00a0GHz regime. In addition to a detailed description of the ice component of this apparatus, we show proof-of-principle experiments demonstrating the detection of H2CO products formed through irradiation of neat methanol ices or 1:1 CO + CH4 mixed ices.<\/jats:p>","DOI":"10.1063\/5.0225903","type":"journal-article","created":{"date-parts":[[2024,9,3]],"date-time":"2024-09-03T12:52:26Z","timestamp":1725367946000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":5,"title":["Buffer gas cooled ice chemistry. II. Ice generation and mm-wave detection of molecules desorbed from an ice"],"prefix":"10.1063","volume":"161","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0709-4225","authenticated-orcid":false,"given":"T. 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