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Nitrogen detection by means of a broad resonance at 9.3 MeV in ^(14)N(α,α)^(14)N elastic backscattering

Qiu, Yuanxun and Rice, A. P. and Tombrello, T. A. (1992) Nitrogen detection by means of a broad resonance at 9.3 MeV in ^(14)N(α,α)^(14)N elastic backscattering. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 71 (3). pp. 324-329. ISSN 0168-583X. doi:10.1016/0168-583X(92)95404-F. https://resolver.caltech.edu/CaltechAUTHORS:20141024-133940014

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Abstract

Because of recent interest in using high energy helium ion backscattering to measure the nitrogen content in heavy substrates, we have determined the differential cross sections for the ^(14)N(α, α)^(14)N non-Rutherford elastic scattering in the energy region 9.1–9.6 MeV at a laboratory scattering angle of 177°. A broad (Γ ∼ 200 keV) resonance around 9.3 MeV was found. The cross section was ∼ 480 mb/sr, about 190 times higher than Rutherford scattering. The resonance, allowing a depth resolution of 40–50 nm, has been used to probe an implanted nitrogen layer in stainless steel and a thick (∼ 4.5 μm) TiN coating on the surface of a high speed steel (HSS) drill bit. For quantitative analysis of nitrogen content a computer simulation method based on fitting the low energy Rutherford portion of the backscattering spectrum is proposed to extract the pseudo-Rutherford surface height of the heavy elements in substrates without knowing their non-Rutherford cross sections at such high energies.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/0168-583X(92)95404-F DOIArticle
http://www.sciencedirect.com/science/article/pii/0168583X9295404FPublisherArticle
Additional Information:© 1992 Elsevier Science Publishers B.V. Received 20 February 1992 and in revised form 13 April 1992. Supported in part by the National Science Foundation [DMR90-11230]. We would like to thank Elzbieta Kolawa and M-A. Nicolet at Caltech for preparation of the TaN and nitrogen implanted samples as well as Steve Stryker for his help in target fabrication and running the tandem accelerator.
Funders:
Funding AgencyGrant Number
NSFDMR90-11230
Issue or Number:3
DOI:10.1016/0168-583X(92)95404-F
Record Number:CaltechAUTHORS:20141024-133940014
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20141024-133940014
Official Citation:Yuanxun Qui, A.P. Rice, T.A. Tombrello, Nitrogen detection by means of a broad resonance at 9.3 MeV in 14N(α, α)14N elastic backscattering, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Volume 71, Issue 3, 1 September 1992, Pages 324-329, ISSN 0168-583X, http://dx.doi.org/10.1016/0168-583X(92)95404-F. (http://www.sciencedirect.com/science/article/pii/0168583X9295404F)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50802
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:24 Oct 2014 22:47
Last Modified:10 Nov 2021 19:01

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