Plasma Chemical Release of Xenon from the Allende Meteorite
Recent advances in plasma chemistry (1-3) have yielded impressive results and hold great promise for meteoritic studies. Our initial experiments (4, unpublished data) indicate that low temperature oxygen plasmas may be effective in extracting noble gases from cosmological samples. One notable advantage is that the noble gases are extracted at temperatures ≤ 250 °C. This reduces background problems associated with the high temperatures necessary for complete gas extraction in ultra-high vacuum heating. Additionally, problems of high temperature diffusive mixing of the component gases are alleviated. Furthermore, the oxygen plasma releases the noble gases from the carbonaceous car rier(s), via oxidation of the carrier to CO(g), C02(g) and H20(g), before significant gas release begins from the other components of the sample. This allows the separation and measurement of the noble gases from the carbonaceous carrier as well as the rest of the meteorite in a single sample.
Presented at the 54th Annual Meeting of the Meteoritical Society.
Physics and Astronomy
R.L. Palma, S.D. Chaffee, M. Hyman and M.W. Rowe, 1991. Plasma Chemical Release of Xenon from the Allende Meteorite. Meteoritics 26, No. 4, 383.
Publisher's Copyright and Source
Copyright © 1991 The Meteoritical Society. Article published by John Wiley and Sons in Meteoritics, volume 26, issue number 4, July 1991, page 383.