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  • Kong, XiangruiUniversity of Gothenburg (author)

Surface solvation of Martian salt analogues at low relative humidities

  • Article/chapterEnglish2022

Publisher, publication year, extent ...

  • 2022
  • Royal Society of Chemistry (RSC),2022

Numbers

  • LIBRIS-ID:oai:lup.lub.lu.se:0c8f6838-fb87-4d41-af58-6c4dc199d2a4
  • https://lup.lub.lu.se/record/0c8f6838-fb87-4d41-af58-6c4dc199d2a4URI
  • https://doi.org/10.1039/d1ea00092fDOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • Salt aerosols play important roles in many processes related to atmospheric chemistry and the climate systems on both Earth and Mars. Complicated and still poorly understood processes occur on the salt surfaces when interacting with water vapor. In this study, ambient pressure X-ray photoelectron spectroscopy (APXPS) is used to characterize the surface chemical environment of Martian salt analogues originating from saline lakes and playas, as well as their responses to varying relative humidities. Generally, APXPS shows similar ionic compositions to those observed by ion chromatography (IC). However, XPS is a surface-sensitive method while IC is bulk-sensitive and differences are observed for species that preferentially partition to the surface or the bulk. Element-selective surface enhancement of Cl− is observed, likely caused by the presence of SO42−. In addition, Mg2+ is concentrated on the surface while Na+ is relatively depleted in the surface layer. Hence, the cations (Na+ and Mg2+) and the anions (Cl− and SO42−) show competitive correlations. At elevated relative humidity (RH), no major spectral changes were observed in the XPS results, except for the growth of an oxygen component originating from condensed H2O. Near-edge X-ray absorption fine structure (NEXAFS) measurements show that the magnesium and sodium spectra are sensitive to the presence of water, and the results imply that the surface is fully solvated already at RH = 5%. The surface solvation is also fully reversible as the RH is reduced. No major differences are observed between sample types and sample locations, indicating that the salts originated from saline lakes commonly have solvated surfaces under the environmental conditions on Earth.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Zhu, SuyunLund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory(Swepub:lu)maxl-syz (author)
  • Shavorskiy, AndreyLund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory(Swepub:lu)maxl-ash (author)
  • Li, JunNorthwest University (China) (author)
  • Liu, WanyuNorthwest University (China) (author)
  • Corral Arroyo, PabloETH Zürich (author)
  • Signorell, RuthETH Zürich (author)
  • Wang, SenNorthwest University (China) (author)
  • Pettersson, Jan B.C.University of Gothenburg (author)
  • University of GothenburgMAX IV-laboratoriet (creator_code:org_t)

Related titles

  • In:Environmental Science: Atmospheres: Royal Society of Chemistry (RSC)2:2, s. 137-1452634-3606

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