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Hydrogen depth profiling by p-p scattering in nominally anhydrous minerals

Wegdén, Marie LU ; Kristiansson, Per LU ; Skogby, H; Auzelyte, Vaida LU ; Elfman, Mikael LU ; Malmqvist, Klas LU ; Nilsson, Christer LU ; Pallon, Jan LU and Shariff, Asad LU (2005) In Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms 231(1-4). p.524-529
Abstract
Hydrogen has been shown to occur as a trace element in many nominally anhydrous minerals. The presence of hydrogen in several of the major minerals in the Earth's mantle has received attention, due to the possibility that these phases provide a significant hydrogen reservoir. Recently an experimental and analytical procedure for hydrogen measurements in thin mineral samples by proton-proton scattering has been developed at the Lund Nuclear Microprobe facility. An annular surface barrier detector, divided in two insulated halves, is used to detect the scattered proton and the recoiled proton in coincidence. The summed energy of each detected proton pair can be used to produce depth profiles if the individual scattering angles are known. The... (More)
Hydrogen has been shown to occur as a trace element in many nominally anhydrous minerals. The presence of hydrogen in several of the major minerals in the Earth's mantle has received attention, due to the possibility that these phases provide a significant hydrogen reservoir. Recently an experimental and analytical procedure for hydrogen measurements in thin mineral samples by proton-proton scattering has been developed at the Lund Nuclear Microprobe facility. An annular surface barrier detector, divided in two insulated halves, is used to detect the scattered proton and the recoiled proton in coincidence. The summed energy of each detected proton pair can be used to produce depth profiles if the individual scattering angles are known. The easiest case is when only a small difference in energy between each detected proton pair is allowed, i.e. scattering angles very close to 45 degrees. This limitation criterion considerably reduces the statistics. For this reason the analytical method has been expanded to use the full detector area (35-55 degrees) and to identify the scattering angles individually for each hydrogen event. Nominally anhydrous minerals, both synthesized and of natural occurrence, with hydrogen concentrations from 10 to 100 ppm have been analysed. Hydrous minerals, as well as Mylar foils were used as standards. Depth profiles show that intrinsic hydrogen can be distinguished from surface contaminations, e.g. water adsorbed on the sample surfaces. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
depth profiling, hydrogen analysis, anhydrous minerals, p-p scattering
in
Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms
volume
231
issue
1-4
pages
524 - 529
publisher
Elsevier
external identifiers
  • wos:000229752400089
  • scopus:33644531285
ISSN
0168-583X
DOI
10.1016/j.nimb.2005.01.111
language
English
LU publication?
yes
id
8429719b-ffaa-4ae5-b0b5-29c6a7e7ee20 (old id 236065)
date added to LUP
2007-08-14 15:43:01
date last changed
2017-01-01 07:12:16
@article{8429719b-ffaa-4ae5-b0b5-29c6a7e7ee20,
  abstract     = {Hydrogen has been shown to occur as a trace element in many nominally anhydrous minerals. The presence of hydrogen in several of the major minerals in the Earth's mantle has received attention, due to the possibility that these phases provide a significant hydrogen reservoir. Recently an experimental and analytical procedure for hydrogen measurements in thin mineral samples by proton-proton scattering has been developed at the Lund Nuclear Microprobe facility. An annular surface barrier detector, divided in two insulated halves, is used to detect the scattered proton and the recoiled proton in coincidence. The summed energy of each detected proton pair can be used to produce depth profiles if the individual scattering angles are known. The easiest case is when only a small difference in energy between each detected proton pair is allowed, i.e. scattering angles very close to 45 degrees. This limitation criterion considerably reduces the statistics. For this reason the analytical method has been expanded to use the full detector area (35-55 degrees) and to identify the scattering angles individually for each hydrogen event. Nominally anhydrous minerals, both synthesized and of natural occurrence, with hydrogen concentrations from 10 to 100 ppm have been analysed. Hydrous minerals, as well as Mylar foils were used as standards. Depth profiles show that intrinsic hydrogen can be distinguished from surface contaminations, e.g. water adsorbed on the sample surfaces.},
  author       = {Wegdén, Marie and Kristiansson, Per and Skogby, H and Auzelyte, Vaida and Elfman, Mikael and Malmqvist, Klas and Nilsson, Christer and Pallon, Jan and Shariff, Asad},
  issn         = {0168-583X},
  keyword      = {depth profiling,hydrogen analysis,anhydrous minerals,p-p scattering},
  language     = {eng},
  number       = {1-4},
  pages        = {524--529},
  publisher    = {Elsevier},
  series       = {Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms},
  title        = {Hydrogen depth profiling by p-p scattering in nominally anhydrous minerals},
  url          = {http://dx.doi.org/10.1016/j.nimb.2005.01.111},
  volume       = {231},
  year         = {2005},
}