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 | |||||||||
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| 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. | |||||||||
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| 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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