Nuclear and Chemical Sciences Division
University of Chicago, USA
University of Bern, Switzerland
Physics and Astronomy|
University of Auckland, NZ
My main research focuses on cosmochemistry, especially the analysis of presolar grain and other meteoritic phases, as well as modeling of cosmogenic nuclides. By measuring the isotopic composition of presolar grains, stellar nucleosynthesis as well as galactic chemical evolution can be studied and constrained. To measure the trace element isotopic composition in these micrometer-sized samples, I use a technique called resonance ionization mass spectrometry (RIMS). RIMS is a high-sensitivity in situ technique that uses the sputtered or desorbed neutral atoms from a sample and resonantly ionizes these atoms using tunable Ti:Sapphire lasers. These photoions are then subsequently analyzed in a time-of-flight mass spectrometer. This technique allows analyzing the trace element isotopic composition of micrometer sized samples without significant isobaric interferences.
In addition, I also develop and apply new models to study the interaction of solar cosmic rays with matter in the Solar System. My models can be used to determine the cosmic ray exposure ages of meteoroids, i.e., the time meteoroids spend in space as individual objects before they fell as meteors to Earth.
Trappitsch R., Boehnke P., Stephan T., Telus M., Savina M. R., Pardo O., Davis A. M., Dauphas N., Pellin M. J., and Huss G. R. (2018) New constraints on the abundance of 60Fe in the early solar system, The Astrophysical Journal Letters 857:L15.
Trappitsch R., Stephan T., Savina M. R., Davis A. M., Pellin M. J., Rost D., Gyngard F., Gallino R., Bisterzo S., Cristallo S., and Dauphas N. (2017) Simultaneous iron and nickel isotopic analyses of presolar silicon carbide grains. Geochimica et Cosmochimica Acta 221:87-108.
Trappitsch R. and Leya I. (2016) Production and recoil loss of cosmogenic nuclides in presolar grains. The Astrophysical Journal 823:12 (11).
Trappitsch R. and Ciesla F. J. (2015) Solar cosmic-ray interaction with protoplanetary disks: production of short-lived radionuclides and amorphization of crystalline material. The Astrophysical Journal 805:5 (11).
Trappitsch R. and Leya I. (2013) Cosmogenic production rates and recoil loss effects in micrometeorites and interplanetary dust particles. Meteoritics & Planetary Science 48:195-210.