Hydrogen concentration analysis in clinopyroxene using proton–proton scattering analysis

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

Traditional methods to measure water in nominally anhydrous minerals (NAMs) are, for example, Fourier transformed infrared (FTIR) spectroscopy or secondary ion mass spectrometry (SIMS). Both well-established methods provide a low detection limit as well as high spatial resolution yet may require elaborate sample orientation or destructive sample preparation. Here we analyze the water content in erupted volcanic clinopyroxene phenocrysts by proton–proton scattering and reproduce water contents measured by FTIR spectroscopy. We show that this technique provides significant advantages over other methods as it can provide a three-dimensional distribution of hydrogen within a crystal, making the identification of potential inclusions possible as well as elimination of surface contamination. The sample analysis is also independent of crystal structure and orientation and independent of matrix effects other than sample density. The results are used to validate the accuracy of wavenumber-dependent vs. mineral-specific molar absorption coefficients in FTIR spectroscopy. In addition, we present a new method for the sample preparation of very thin crystals suitable for proton–proton scattering analysis using relatively low accelerator potentials.

Detaljer

Författare
  • Franz A. Weis
  • Linus Ros
  • Patrick Reichart
  • Henrik Skogby
  • Per Kristiansson
  • Günther Dollinger
Enheter & grupper
Externa organisationer
  • Uppsala universitet
  • Naturhistoriska riksmuseet
  • Bundeswehr University Munich
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Geofysik

Nyckelord

Originalspråkengelska
Sidor (från-till)669-678
TidskriftPhysics and Chemistry of Minerals
Volym45
Utgåva nummer7
Tidigt onlinedatum2018 feb 17
StatusPublished - 2018 jul
PublikationskategoriForskning
Peer review utfördJa