High resolution depth profiling in near-surface regions of solids by narrow nuclear reaction resonances below 0.5 MeV with low energy spread proton beams

WH Schulte, H. Ebbing, HW Becker, M. Berheide, M. Buschmann, C. Angulo, C. Rolfs, G. Amsel, I. Trimaille, G. Battistig, GE Mitchell, JS Schweitzer

Research output: Contribution to journalArticle

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Abstract

The application of proton-induced narrow resonances in nuclear reactions as probes for depth profiling near-surface regions of solids has been investigated at projectile energies below 400 keV. The measurements were performed at the Universität Münster 400 kV accelerator, which provided intense proton beams with an energy spread of about 15 eV. The energy stability of the accelerator was better than ±3 eV. Narrow resonances in the reactions 18O(p, γ) 19F, 18O(p, α) 15N, 23Na(p, γ) 24Mg, and 29Si(p, γ) 30P were studied. For resonances with an intrinsic width in the electronvolt range, the thermal Doppler broadening dominates the effective energy resolution. With such narrow resonances as probes, contaminants on the surface with a thickness as small as some atomic layers have a significant influence on the shape of the yield curve and for optimal results uhv conditions are required. The method is illustrated with depth profiling experiments of 18O and 23Na with potential near-surface depth resolutions of some tens of Ångstroms.

Original languageEnglish
Pages (from-to)185-190
Number of pages6
JournalVacuum
Volume44
Issue number3-4
DOIs
Publication statusPublished - 1993

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Proton beams
Nuclear reactions
Depth profiling
proton beams
nuclear reactions
high resolution
Particle accelerators
accelerators
energy
probes
Doppler effect
Projectiles
contaminants
Protons
projectiles
Impurities
protons
curves
Experiments

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

High resolution depth profiling in near-surface regions of solids by narrow nuclear reaction resonances below 0.5 MeV with low energy spread proton beams. / Schulte, WH; Ebbing, H.; Becker, HW; Berheide, M.; Buschmann, M.; Angulo, C.; Rolfs, C.; Amsel, G.; Trimaille, I.; Battistig, G.; Mitchell, GE; Schweitzer, JS.

In: Vacuum, Vol. 44, No. 3-4, 1993, p. 185-190.

Research output: Contribution to journalArticle

Schulte, WH, Ebbing, H, Becker, HW, Berheide, M, Buschmann, M, Angulo, C, Rolfs, C, Amsel, G, Trimaille, I, Battistig, G, Mitchell, GE & Schweitzer, JS 1993, 'High resolution depth profiling in near-surface regions of solids by narrow nuclear reaction resonances below 0.5 MeV with low energy spread proton beams', Vacuum, vol. 44, no. 3-4, pp. 185-190. https://doi.org/10.1016/0042-207X(93)90151-Y
Schulte, WH ; Ebbing, H. ; Becker, HW ; Berheide, M. ; Buschmann, M. ; Angulo, C. ; Rolfs, C. ; Amsel, G. ; Trimaille, I. ; Battistig, G. ; Mitchell, GE ; Schweitzer, JS. / High resolution depth profiling in near-surface regions of solids by narrow nuclear reaction resonances below 0.5 MeV with low energy spread proton beams. In: Vacuum. 1993 ; Vol. 44, No. 3-4. pp. 185-190.
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AU - Becker, HW

AU - Berheide, M.

AU - Buschmann, M.

AU - Angulo, C.

AU - Rolfs, C.

AU - Amsel, G.

AU - Trimaille, I.

AU - Battistig, G.

AU - Mitchell, GE

AU - Schweitzer, JS

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N2 - The application of proton-induced narrow resonances in nuclear reactions as probes for depth profiling near-surface regions of solids has been investigated at projectile energies below 400 keV. The measurements were performed at the Universität Münster 400 kV accelerator, which provided intense proton beams with an energy spread of about 15 eV. The energy stability of the accelerator was better than ±3 eV. Narrow resonances in the reactions 18O(p, γ) 19F, 18O(p, α) 15N, 23Na(p, γ) 24Mg, and 29Si(p, γ) 30P were studied. For resonances with an intrinsic width in the electronvolt range, the thermal Doppler broadening dominates the effective energy resolution. With such narrow resonances as probes, contaminants on the surface with a thickness as small as some atomic layers have a significant influence on the shape of the yield curve and for optimal results uhv conditions are required. The method is illustrated with depth profiling experiments of 18O and 23Na with potential near-surface depth resolutions of some tens of Ångstroms.

AB - The application of proton-induced narrow resonances in nuclear reactions as probes for depth profiling near-surface regions of solids has been investigated at projectile energies below 400 keV. The measurements were performed at the Universität Münster 400 kV accelerator, which provided intense proton beams with an energy spread of about 15 eV. The energy stability of the accelerator was better than ±3 eV. Narrow resonances in the reactions 18O(p, γ) 19F, 18O(p, α) 15N, 23Na(p, γ) 24Mg, and 29Si(p, γ) 30P were studied. For resonances with an intrinsic width in the electronvolt range, the thermal Doppler broadening dominates the effective energy resolution. With such narrow resonances as probes, contaminants on the surface with a thickness as small as some atomic layers have a significant influence on the shape of the yield curve and for optimal results uhv conditions are required. The method is illustrated with depth profiling experiments of 18O and 23Na with potential near-surface depth resolutions of some tens of Ångstroms.

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