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Evan Groopman
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Inferred initial 26Al/27Al ratios in presolar stardust grains from supernovae are higher than previously estimated
E Groopman, E Zinner, S Amari, F Gyngard, P Hoppe, M Jadhav, Y Lin, ...
The Astrophysical Journal 809 (1), 31, 2015
342015
Jamming in systems with quenched disorder
CJO Reichhardt, E Groopman, Z Nussinov, C Reichhardt
Physical Review E 86 (6), 061301, 2012
342012
C, N, and O isotopic heterogeneities in low-density supernova graphite grains from Orgueil
E Groopman, T Bernatowicz, E Zinner
The Astrophysical Journal Letters 754 (1), L8, 2012
242012
Refractory metal nuggets within presolar graphite: First condensates from a circumstellar environment
TK Croat, T Berg, T Bernatowicz, E Groopman, M Jadhav
Meteoritics & Planetary Science 48 (4), 686-699, 2013
222013
Measurement of Uranium Isotopes in Particles of U3O8 by Secondary Ion Mass Spectrometry–Single-Stage Accelerator Mass Spectrometry (SIMS–SSAMS)
AJ Fahey, EE Groopman, KS Grabowski, KC Fazel
Analytical chemistry 88 (14), 7145-7153, 2016
172016
An overview of NRL's NAUTILUS: a combination SIMS-AMS for spatially resolved trace isotope analysis
EE Groopman, DG Willingham, AJ Fahey, KS Grabowski
Journal of analytical atomic spectrometry 35 (3), 600-625, 2020
112020
Discovery of fissionogenic Cs and Ba capture five years after Oklo reactor shutdown
EE Groopman, DG Willingham, AP Meshik, OV Pravdivtseva
Proceedings of the National Academy of Sciences 115 (35), 8676-8681, 2018
112018
Correlated XANES, TEM, and NanoSIMS of presolar graphite grains
EE Groopman, LR Nittler
Geochimica et Cosmochimica Acta 221, 219-236, 2018
102018
Rapid, molecule-free, in situ rare earth element abundances by SIMS-SSAMS
EE Groopman, KS Grabowski, AJ Fahey, L Kööp
Journal of Analytical Atomic Spectrometry 32 (11), 2153-2163, 2017
92017
Improved uranium particle analysis by SIMS using O 3− primary ions
EE Groopman, TL Williamson, DS Simons
Journal of analytical atomic spectrometry 37 (10), 2089-2102, 2022
82022
NanoSIMS, TEM, and XANES studies of a unique presolar supernova graphite grain
E Groopman, LR Nittler, T Bernatowicz, E Zinner
The Astrophysical Journal 790 (1), 9, 2014
82014
Direct, uncorrected, molecule-free analysis of 236 U from uranium-bearing particles with NAUTILUS: a new kind of mass spectrometer
D Willingham, EE Groopman, KS Grabowski, L Sangely
Analyst 143 (22), 5364-5371, 2018
72018
Orgueil Low-Density Presolar Carbon ain't Graphite but Glassy Carbon
B Wopenka, E Groopman, E Zinner
Meteoritics and Planetary Science Supplement 74, 5032, 2011
52011
U–Pu Mixed Oxide Particle Analysis by NAUTILUS and Implications for Next-Generation Verification Challenges
D Willingham, E Groopman, L Sangely
Journal of the American Society for Mass Spectrometry 31 (8), 1647-1655, 2020
42020
Long-term retention and chemical fractionation of fissionogenic Cs and Tc in Oklo natural nuclear reactor fuel
EE Groopman, LR Nittler, DG Willingham, AP Meshik, OV Pravdivtseva
Applied Geochemistry 131, 105047, 2021
32021
Enhanced spatially-resolved trace analysis using combined SIMS–single-stage AMS
KS Grabowski, EE Groopman, AJ Fahey
Nuclear Instruments and Methods in Physics Research Section B: Beam …, 2017
32017
Positive ion SIMS-SSAMS for trace analysis of materials
KS Grabowski, EE Groopman, BY Rock, MA Imam
Nuclear Instruments and Methods in Physics Research Section B: Beam …, 2019
22019
Trace element determination in presolar grains with the NRL SIMS-SSAMS
EE Groopman, AJ Fahey, KS Grabowski
79th Annual Meeting of the Meteoritical Society 79 (1921), 6196, 2016
22016
Isotopic composition and trace element abundances of a presolar SiC AB grain reconstructed by atom-probe tomography
JB Lewis, D Isheim, C Floss, E Groopman, F Gyngard, DN Seidman
77th Annual Meeting of the Meteoritical Society 77 (1800), 5367, 2014
22014
Ti-XANES and EELS of presolar TiC subgrains within low-density supernova graphite grains
EE Groopman, TL Daulton, LR Nittler, TJ Bernatowicz, EK Zinner
Meteoritics and Planetary Science Supplement 75, 5225, 2012
22012
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Articles 1–20