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Hydrogen concentration analysis in clinopyroxene using proton–proton scattering analysis

Weis, Franz A.; Ros, Linus LU ; Reichart, Patrick; Skogby, Henrik; Kristiansson, Per LU and Dollinger, Günther (2018) In Physics and Chemistry of Minerals
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... (More)

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.

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author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Clinopyroxene, FTIR, Hydrogen, NAMs, Proton–proton scattering
in
Physics and Chemistry of Minerals
pages
10 pages
publisher
Springer
external identifiers
  • scopus:85042079351
ISSN
0342-1791
DOI
10.1007/s00269-018-0953-2
language
English
LU publication?
yes
id
24aa283d-7a66-4d8b-afe0-5afba6895170
date added to LUP
2018-03-06 08:54:27
date last changed
2018-05-29 09:20:37
@article{24aa283d-7a66-4d8b-afe0-5afba6895170,
  abstract     = {<p>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.</p>},
  author       = {Weis, Franz A. and Ros, Linus and Reichart, Patrick and Skogby, Henrik and Kristiansson, Per and Dollinger, Günther},
  issn         = {0342-1791},
  keyword      = {Clinopyroxene,FTIR,Hydrogen,NAMs,Proton–proton scattering},
  language     = {eng},
  month        = {02},
  pages        = {10},
  publisher    = {Springer},
  series       = {Physics and Chemistry of Minerals},
  title        = {Hydrogen concentration analysis in clinopyroxene using proton–proton scattering analysis},
  url          = {http://dx.doi.org/10.1007/s00269-018-0953-2},
  year         = {2018},
}