Electronic excitation of an atom by an ion in the energy regime below keV/u can be strongly coupled with elastic scattering. This feature may cause noticeable deviations in the energy loss of light ions such as protons and deuterons from velocity-proportionality and is found to be an essential ingredient in the understanding of the stopping behavior near the threshold. We have incorporated this effect into the PASS stopping code and, in this way, expanded the range of validity of the code down to around 1 keV/u. Comparison of calculated with measured stopping cross sections for protons in Ag, Au, Cu, and Ni shows good agreement with recent data that deviate dramatically from the commonly assumed velocity proportionality. Most of these data were determined by the analysis of reflected-ion spectra. Computation of reflected-ion spectra with energy-loss functions from PASS leads to good agreement with measured spectra. A direct consequence of the coupling with elastic collisions is isotope dependence of the electronic-stopping cross section. Conventional stopping theory denies the existence of a significant isotope effect. Present calculations suggest an effect in the 1–10% range for hydrogen in Si at energies around and below 10 keV/u. This is found to be compatible with experimental data.
Skip Nav Destination
Article navigation
14 May 2021
Research Article|
May 12 2021
Threshold behavior and isotope effect in low-energy electronic stopping of light ions
Andreas Schinner;
Andreas Schinner
1
Department of Experimental Physics, Johannes Kepler University
, A-4040 Linz, Austria
Search for other works by this author on:
Vladimir I. Shulga
;
Vladimir I. Shulga
2
Skobeltsin Institute of Nuclear Physics, Lomonosov Moscow State University
, 119991 Moscow, Russia
Search for other works by this author on:
Peter Sigmund
Peter Sigmund
a)
3
Department of Physics, Chemistry and Pharmacy, University of Southern Denmark
, DK-5230 Odense, Denmark
a)Author to whom correspondence should be addressed: sigmund@sdu.dk
Search for other works by this author on:
a)Author to whom correspondence should be addressed: sigmund@sdu.dk
J. Appl. Phys. 129, 185304 (2021)
Article history
Received:
February 03 2021
Accepted:
April 27 2021
Citation
Andreas Schinner, Vladimir I. Shulga, Peter Sigmund; Threshold behavior and isotope effect in low-energy electronic stopping of light ions. J. Appl. Phys. 14 May 2021; 129 (18): 185304. https://doi.org/10.1063/5.0046401
Download citation file:
Sign in
Don't already have an account? Register
Sign In
You could not be signed in. Please check your credentials and make sure you have an active account and try again.
Sign in via your Institution
Sign in via your InstitutionPay-Per-View Access
$40.00
Citing articles via
Related Content
Hydrogen blister depth in boron and hydrogen coimplanted n-type silicon
Appl. Phys. Lett. (December 1999)
Use of combined linear and nonlinear formalisms applied to the transport of protons and secondary electrons in a Monte Carlo code: Applications for space missions
J. Appl. Phys. (October 2022)
Methods for the accurate analysis of channeling Rutherford backscattering spectrometry
Appl. Phys. Lett. (August 2005)
Optimized energy window of He beams for accurate determination of depth in channeling Rutherford backscattering spectrometry
Appl. Phys. Lett. (May 2005)
Preface: Turkish Physical Society 35th International Physics Congress (TPS35)
AIP Conference Proceedings (November 2019)