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Apr 01, 2018 Ion funnel augmented Mars atmospheric pressure photoionization mass spectrometry for in situ detection of organic molecules.. PubMed. Johnson, Paul V; Hodyss, Robert; Beauchamp, J L. 2014 11 01. Laser desorption is an attractive technique for in situ sampling of organics on Mars given its relative simplicity. We demonstrate that under simulated Martian conditions (~2.5 Torr CO(2)) laser