PNASJClub
Mass-independent oxygen isotope fractionation driven by energetic-particle irradiation of icy solids.
Proceedings of the National Academy of Sciences · · Journal Article · Open access
Dominguez, Caplan + more
Abstract ↗AI summary
The abstract is read at the publisher; the summary is JClub's.
Energetic particle irradiation of icy solids at 10 K causes measurable mass-independent oxygen isotope fractionation in SiO2 and Al2O3 substrates, with substrate-dependent trends.
- Why it matters: Understanding MIF in condensed phases expands knowledge of isotope anomalies beyond gas-phase processes, addressing a key gap in planetary and atmospheric chemistry.
- What they did: Laboratory experiments involved electron irradiation of SiO2 and Al2O3 substrates with H2O ice, revealing shifts in Δ17O and substrate-dependent isotope relationships, including slope-1-like behavior.
- The result: The findings suggest irradiation-induced defect formation and interfacial chemistry can produce significant oxygen isotope heterogeneity, aiding interpretation of isotope signatures in extraterrestrial and early solar system materials.
The findingWhy it mattersWhat they didThe result
- Open access