Overview The stable isotope lab at Johns Hopkins University is centered around a Thermo MAT 253 isotope ratio mass spectrometer with 8 Faraday cups configured for CO2 isotopologues (m/z 44-49), O2 (m/z 32-36), and other gases (N2, CO). The lab currently specializes in three measurements: carbonate clumped isotopes, triple-oxygen isotopes of waters, and laser ablation carbon- and oxygen-isotope analysis of bioapatites. The lab also has furnaces, ovens, centrifuges, microscopes, high P-T reaction vessels, and other supporting equipment for sample preparation and experimental geochemistry. Outside Work Our internal group of users and external colleagues utilize nearly all available machine time on our MAT 253, but we try to make room for promising new ideas. We typically work with outside colleagues on a collaborative basis, but are willing to consider contract work. Please contact us for further information. Contact Naomi Levin (nlevin3@jhu.edu) Ben Passey (bhpassey@jhu.edu)  | Zelalem Bedaso (Postdoc) Greg Henkes (PhD student) Rebecca Kraft (PhD student) Shuning Li (PhD student) Alumnus Marina Suarez (postdoc 2009-2011, now Asst. Prof. at University of Texas San Antonio). JHU Lab Results: Abstracts (full listing and PDFs) Li et al. 2011, Isoscapes, Purdue Passey et al. 2011, GSA, Minneapolis Kraft et al. 2011, GSA, Minneapolis Suarez and Passey 2011, GSA, Minneapolis Kaufman et al. 2011, GSA, Minneapolis  | Equipment MAT 253 mass spectrometer Autoline (carbonate clumped-isotopes) Water Fluorination Line (17O-excess) IR laser ablation (d13C, d18O microanalysis) Glass Extraction Line (multipurpose) National Geographic Society (2011-2012) ACS Petroleum Research Fund (2010-2012) NSF BCS Archeology (2010-2012) JHU Krieger School of Arts and Sciences JHU Dept of Earth and Planetary Sciences  |