PP21A-2204
Determining Clumped Isotope (Δ47) Signatures of CO2 During Ion-Molecule Isotopic Exchange Reactions

Tuesday, 15 December 2015
Poster Hall (Moscone South)
Joshua Sarna1, Antra Priyadarshi2, Poline Pourmorady1,2, Aradhna Tripati1,2 and Jonathan Estaris1,2, (1)University of California Los Angeles, Los Angeles, CA, United States, (2)University of California Los Angeles, Department of Earth, Planetary, and Space Sciences, Los Angeles, CA, United States
Abstract:
The abundance of multiply-substituted isotopologues such as 13C16O18O can be used to understand fundamental mechanisms that controls isotopic fractionation in chemical reactions. Knowledge of the energy-dependent ion-molecule isotopic exchange rate for 13C16O18O may also provide important insights into the CO2 ion-molecular exchange that occurs in the source of the mass spectrometer. It may offer an explanation for the recently observed nonlinearities associated with clumped isotope measurements.

We designed a controlled set of laboratory experiments to investigate variations in the abundance of 13C16O18O associated with different ion-molecular isotopic exchange reactions. In our experiments, we characterize the effects of changing ionization energy, reaction time, CO2 amount, the presence of different compounds, and reaction chamber temperature on the clumped isotopic composition of CO2.

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