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Paardekooper, D.M.; Bossa, J.B.; Isokoski, K.; Linnartz, H.V.J. (2014)

Laser desorption time-of-flight mass spectrometry of ultraviolet photo-processed ices

Abstract
A new ultra-high vacuum experiment is described that allows studying photo-induced chemical processes in interstellar ice analogues. MATRI2CES - a Mass Analytical Tool to study Reactions in Interstellar ICES applies a new concept by combining laser desorption and time-of-flight mass spectrometry with the ultimate goal to characterize in situ and in real time the solid state evolution of organic compounds upon UV photolysis for astronomically relevant ice mixtures and temperatures. The performance of the experimental setup is demonstrated by the kinetic analysis of the different photoproducts of pure methane (CH4) ice at 20 K. A quantitative approach provides formation yields of several new species with up to four carbon atoms. Convincing evidence is found for the formation of even larger species. Typical mass resolutions obtained range from M/M ∼320 to ∼400 for CH4 and argon, respectively. Additional tests show that the typical detection limit (in monolayers) is ≤0.02 ML,...Show moreA new ultra-high vacuum experiment is described that allows studying photo-induced chemical processes in interstellar ice analogues. MATRI2CES - a Mass Analytical Tool to study Reactions in Interstellar ICES applies a new concept by combining laser desorption and time-of-flight mass spectrometry with the ultimate goal to characterize in situ and in real time the solid state evolution of organic compounds upon UV photolysis for astronomically relevant ice mixtures and temperatures. The performance of the experimental setup is demonstrated by the kinetic analysis of the different photoproducts of pure methane (CH4) ice at 20 K. A quantitative approach provides formation yields of several new species with up to four carbon atoms. Convincing evidence is found for the formation of even larger species. Typical mass resolutions obtained range from M/M ∼320 to ∼400 for CH4 and argon, respectively. Additional tests show that the typical detection limit (in monolayers) is ≤0.02 ML, substantially more sensitive than the regular techniques used to investigate chemical processes in interstellar ices.Show less
All authors
Paardekooper, D.M.; Bossa, J.B.; Isokoski, K.; Linnartz, H.V.J.
Date
2014-10-10
Title of host publication
Review of Scientific Instruments
Volume
85
Pages
104501
DOI
doi:10.1063/1.4896754

Funding

Sponsorship
Seventh Framework Programme (FP7)