THE UNIVERSITY OF ALABAMA University Libraries Investigating Potential Sources of Mercury’s Exospheric Calcium: Photon-Stimulated Desorption of Calcium Sulfide Alice DeSimone – Georgia Institute of Technology et al. Deposited 10/23/2018 Citation of published version: Bennett, C., et al. (2016): Investigating Potential Sources of Mercury’s Exospheric Calcium: Photon-Stimulated Desorption of Calcium Sulfide. Journal of Geophysical Research, 121(2). DOI: https://doi.org/10.1002/2015JE004966 © 2016. American Geophysical Union. All Rights Reserved. ~AGU.PUBLICATION S I Journal of Geophysical Research: Planets RESEARCH ARTICLE Investigating potential sources of Mercury’s exospheric 10.1002/2015JE004966 Calcium: Photon-stimulated desorption Key Points: of Calcium Sulfide • Photon-stimulated desorption (PSD) of CaS is investigated at λ = 355 nm Chris J. Bennett1, Jason L. McLain2,3, Menelaos Sarantos3,4, Reuben D. Gann1, Alice DeSimone1, • Desorption cross sections and velocity 1 distributions are determined for Ca0 and Thomas M. Orlando • ’ PSD contributions to Mercury s 1 2 exospheric calcium are modeled Department of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia, USA, Astronomy Department, University of Maryland, College Park, Maryland, USA, 3NASA Goddard Space Flight Center, Greenbelt, Maryland, USA, 4Goddard Planetary Heliophysics Institute, University of Maryland, Baltimore County, Baltimore, Maryland, USA Supporting Information: • Text S1 and Tables S1–S4 Abstract Ground-based and MErcury Surface, Space ENvironment, GEochemistry, and Ranging observations Correspondence to: 0 + ’ T. M. Orlando, detected Ca and Ca in the exosphere of Mercury as well as unexpectedly high levels of sulfur on Mercury s
[email protected] surface. The mineral oldhamite ((Mg,Ca)S) could be a predominant component of the Mercury surface, particularly within the hollows identified within craters, and could therefore serve as a source of the Citation: observed exospheric calcium.