Oxygen isotopic fractionation in the condensation of refractory smokesThis paper reports preliminary measurements of the oxygen isotopic fractionation that occurs during the condensation of refractory metal oxide smokes. Fractionation occurred at temperatures in excess of 500 K during and/or subsequent to reaction of SiH4, Fe(CO)5, Al(CH3)3, and O2 in a H2 carrier gas. Observed isotopic fractionation was as high as -15 per mil/amu. The magnitude of the isotopic fractionation suggests that the process is kinetically controlled since the effect is greatly in excess of that expected for equilibrium isotopic exchange.
Document ID
19890049164
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Nelson, R. (Georgia Southern College Statesboro, United States)
Thiemens, M. (California, University La Jolla, United States)
Nuth, J. (California Univ. La Jolla, CA, United States)
Donn, B. (NASA Goddard Space Flight Center Greenbelt, MD, United States)