Speaker
Mr
Linus Ros
(Division of Nuclear Physics, Department of Physics, Lund University, Sweden)
Description
Many primitive meteorites show elevated D/H-ratios relative to terrestrial material. It is believed that this is due to the preservation of the organic molecules which were formed in the presolar molecular cloud [1]. The D/H-ratio varies considerably between different classes of meteorites. This isotopic variation is due to different degrees of mixing of the presolar material with solar system materials [1]. Isotopic measurements of extraterrestrial material collected at Earth provide a way to compare the degree of mixing of the primordial molecules among different solar system material [1].
In recent years a quantitative technique for D/H-ratio microscopy has been developed at Lund Ion Beam Analysis Facility (LIBAF). The technique is derived from the proton-proton scattering technique and has been proven to have the same beneficial features, namely low detection limit, high lateral resolution, and insignificant matrix effects [2, 3]. In this work we present and discuss the results from a measurement on samples from the Tagish Lake meteorite, which is suggested to be one of the most primitive solar system material yet studied [4]. We also present an evaluation of the technique, with results of measurements on a geological standard.
[1] Messenger, S. Nature 404 (2000) 968-971
[2] L. Ros, M. Borysiuk, P. Kristiansson, N. Abdel, M. Elfman, P. Golubev, E.J.C. Nilsson, J. Pallon, Nucl. Instr. Meth. B. 306 (2013) 54-58
[3] L. Ros, M. Borysiuk, P. Kristiansson, N. Abdel, M. Elfman, E.J.C. Nilsson, and J. Pallon.Nucl. Instr. Meth. B (2014), http://dx.doi.org/10.1016/j.nimb.2014.02.058
[4] Brown, P. G et al Science 290 (2000) 320-325
Primary author
Mr
Linus Ros
(Division of Nuclear Physics, Department of Physics, Lund University, Sweden)
Co-authors
Dr
Charlotta Nilsson
(Division of Nuclear Physics, Department of Physics, Lund University, Sweden)
Prof.
Jan Pallon
(Division of Nuclear Physics, Department of Physics, Lund University, Sweden)
Dr
Maciek Borysiuk
(Division of Nuclear Physics, Department of Physics, Lund University, Sweden)
Dr
Mikael Elfman
(Division of Nuclear Physics, Department of Physics, Lund University, Sweden)
Mr
Naseem Abdel
(Division of Nuclear Physics, Department of Physics, Lund University, Sweden)
Prof.
Per Kristiansson
(Division of Nuclear Physics, Department of Physics, Lund University, Sweden)
