Calculation of energyloss straggling of C, Al, Si, and Cu for fast H, He, and Li ions
Abstract
We present theoretical calculations of the energyloss straggling of C, Al, Si, and Cu targets for H, He, and Li ions in the range of intermediate to high energies (0.0110 MeV/u). These calculations have been done by employing the dielectric formalism and by considering the different equilibrium charge states of the swift ion inside the solid as a function of its energy. Two different models are used: the Mermin energyloss functions combined with generalized oscillator strengths (MELFGOS) and the shellwise application of the local plasma approximation (SLPA). The MELFGOS describes the target outerelectron excitations through a fitting to experimental data in the optical limit, employing a linear combination of Mermintype energyloss functions; the excitations of the innershell electrons are taken into account by means of generalized oscillator strengths. The SLPA employs a freeelectrongas model for the target valence electrons and the local density approximation for each shell of target electrons separately by using HartreeFock atomic wave functions. The results of the energyloss straggling obtained by the two independent models show good agreement with the available experimental data. The calculated energyloss straggling tends at high energies to the Bohr value and takes values below it at intermediate energies. The BetheLivingston shouldermore »
 Authors:
 Instituto de Astronomia y Fisica del Espacio, Casilla de correo 67, Sucursal 28, 1428 Buenos Aires (Argentina)
 (Argentina)
 (Spain)
 Publication Date:
 OSTI Identifier:
 20982137
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: Physical Review. A; Journal Volume: 75; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevA.75.022903; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 74 ATOMIC AND MOLECULAR PHYSICS; ALUMINIUM; ATOMIC IONS; CARBON; CHARGE STATES; COMPUTER CALCULATIONS; COPPER; DENSITY FUNCTIONAL METHOD; ELECTRON GAS; ENERGY LOSSES; EXCITED STATES; HARTREEFOCK METHOD; HELIUM IONS; HYDROGEN IONS; IONATOM COLLISIONS; KEV RANGE; LITHIUM IONS; MEV RANGE 0110; OSCILLATOR STRENGTHS; SILICON; WAVE FUNCTIONS
Citation Formats
Montanari, C. C., Miraglia, J. E., HerediaAvalos, Santiago, GarciaMolina, Rafael, Abril, Isabel, Departamento de Fisica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Departamento de Fisica  CIOyN, Universidad de Murcia, Apartado 4021, E30080 Murcia, and Departament de Fisica Aplicada, Universitat d'Alacant, Apartat 99, E03080 Alacant. Calculation of energyloss straggling of C, Al, Si, and Cu for fast H, He, and Li ions. United States: N. p., 2007.
Web. doi:10.1103/PHYSREVA.75.022903.
Montanari, C. C., Miraglia, J. E., HerediaAvalos, Santiago, GarciaMolina, Rafael, Abril, Isabel, Departamento de Fisica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Departamento de Fisica  CIOyN, Universidad de Murcia, Apartado 4021, E30080 Murcia, & Departament de Fisica Aplicada, Universitat d'Alacant, Apartat 99, E03080 Alacant. Calculation of energyloss straggling of C, Al, Si, and Cu for fast H, He, and Li ions. United States. doi:10.1103/PHYSREVA.75.022903.
Montanari, C. C., Miraglia, J. E., HerediaAvalos, Santiago, GarciaMolina, Rafael, Abril, Isabel, Departamento de Fisica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Departamento de Fisica  CIOyN, Universidad de Murcia, Apartado 4021, E30080 Murcia, and Departament de Fisica Aplicada, Universitat d'Alacant, Apartat 99, E03080 Alacant. Thu .
"Calculation of energyloss straggling of C, Al, Si, and Cu for fast H, He, and Li ions". United States.
doi:10.1103/PHYSREVA.75.022903.
@article{osti_20982137,
title = {Calculation of energyloss straggling of C, Al, Si, and Cu for fast H, He, and Li ions},
author = {Montanari, C. C. and Miraglia, J. E. and HerediaAvalos, Santiago and GarciaMolina, Rafael and Abril, Isabel and Departamento de Fisica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires and Departamento de Fisica  CIOyN, Universidad de Murcia, Apartado 4021, E30080 Murcia and Departament de Fisica Aplicada, Universitat d'Alacant, Apartat 99, E03080 Alacant},
abstractNote = {We present theoretical calculations of the energyloss straggling of C, Al, Si, and Cu targets for H, He, and Li ions in the range of intermediate to high energies (0.0110 MeV/u). These calculations have been done by employing the dielectric formalism and by considering the different equilibrium charge states of the swift ion inside the solid as a function of its energy. Two different models are used: the Mermin energyloss functions combined with generalized oscillator strengths (MELFGOS) and the shellwise application of the local plasma approximation (SLPA). The MELFGOS describes the target outerelectron excitations through a fitting to experimental data in the optical limit, employing a linear combination of Mermintype energyloss functions; the excitations of the innershell electrons are taken into account by means of generalized oscillator strengths. The SLPA employs a freeelectrongas model for the target valence electrons and the local density approximation for each shell of target electrons separately by using HartreeFock atomic wave functions. The results of the energyloss straggling obtained by the two independent models show good agreement with the available experimental data. The calculated energyloss straggling tends at high energies to the Bohr value and takes values below it at intermediate energies. The BetheLivingston shoulder (or overshooting) at intermediate energies does not appear in the present calculations. We find that the energyloss straggling normalized to Z{sub P}{sup 2} is almost independent of the ion atomic number Z{sub P}; therefore, the results for H, He, and Li projectiles in each target can be approximated by a universal curve at high energies.},
doi = {10.1103/PHYSREVA.75.022903},
journal = {Physical Review. A},
number = 2,
volume = 75,
place = {United States},
year = {Thu Feb 15 00:00:00 EST 2007},
month = {Thu Feb 15 00:00:00 EST 2007}
}

Energy loss and straggling for 50 and 100keV H{sup +} ions passing through the Si(001)2{times}1Sb surface
Surface stopping powers were measured for 50 and 100keV H{sup +} ions passing through the Si(001)2{times}1Sb surface. The energy losses as a function of the exit angle are fit successfully by a simple relationship involving the time spent near the surface. The fitting parameter is in agreement with the value expected from the bulk Sb stopping cross section and the areal Sb density. This result suggests continuity of the stopping power from the bulk to the surface. It provides a useful method for determining the distance between the plane of deposited atoms and of a substrate surface and for measuringmore » 
Impactparameter dependence of electronic energy loss and straggling of incident bare ions on H and He atoms by using the coupledchannel method
A firstprinciples calculation based on an expansion of the timedependent electronic wave function in terms of atomic orbitals (coupledchannel method) has been applied to evaluate the impactparameter dependence of the electronic energy loss and the fluctuation in energy loss of swift ions colliding on H and He atoms at energies of 10 to 500 keV/amu. The results have been compared with experimental data as well as with other existing models, e.g., the localdensity approximation in an electrongas target, the harmonicoscillator target treatment, and the firstorder planewaveBorn approximation. Our results show a nearly exponential shape of the mean electronic energy lossmore »