1. Department of Geology; Lund University; Sölvegatan 12 Lund SE-223 62 Sweden
2. School of Earth Sciences; The Ohio State University; 125 S. Oval Mall Columbus OH 43210 USA
3. AstroGeoBiology Laboratory; Department of Physics; P.O. Box 118 Lund SE-221 00 Sweden
4. Swiss Light Source; Paul Scherrer Institute; Villigen CH-5232 Switzerland