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Title: Energy-loss straggling of helium projectiles at low kinetic energies

Abstract

Concentration depth profiles at liquid surfaces can be determined by means of neutral impact collision ion scattering spectroscopy. The energy resolution of the spectra is influenced by the energy loss straggling of the projectiles. Energy loss straggling is a measure of the width of the energy loss distribution of particles passing through matter. Knowledge of the energy loss straggling is especially important for determining concentration depth profiles of aqueous surfaces. Here it is shown that the energy loss in the gas phase and the energy loss distribution can be determined with a series of spectra taken at different vapor pressures of the aqueous solution. The projectiles used are 3 keV helium ions. The gas phase causes a shift of the spectra to lower energies and a broadening of the structure due to energy loss straggling. Both the energy loss in the gas phase and the energy loss straggling must be gauged in order to determine concentration depth profiles quantitatively. Knowledge of the energy loss distribution can be used to determine accurate concentration depth profiles by means of deconvolution.

Authors:
 [1]
  1. Wilhelm-Ostwald-Institute for Physical and Theoretical Chemistry, Leipzig University, Linnestrasse 3, 04103 Leipzig (Germany)
Publication Date:
OSTI Identifier:
20982346
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 75; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevA.75.032901; (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; AQUEOUS SOLUTIONS; COLLISIONS; DISTRIBUTION; ENERGY LOSSES; ENERGY RESOLUTION; HELIUM; HELIUM IONS; KEV RANGE 01-10; KINETIC ENERGY; LIQUIDS; SCATTERING; SPECTRA; SPECTRAL SHIFT; SPECTROSCOPY; SURFACES; VAPOR PRESSURE

Citation Formats

Andersson, Gunther. Energy-loss straggling of helium projectiles at low kinetic energies. United States: N. p., 2007. Web. doi:10.1103/PHYSREVA.75.032901.
Andersson, Gunther. Energy-loss straggling of helium projectiles at low kinetic energies. United States. doi:10.1103/PHYSREVA.75.032901.
Andersson, Gunther. Thu . "Energy-loss straggling of helium projectiles at low kinetic energies". United States. doi:10.1103/PHYSREVA.75.032901.
@article{osti_20982346,
title = {Energy-loss straggling of helium projectiles at low kinetic energies},
author = {Andersson, Gunther},
abstractNote = {Concentration depth profiles at liquid surfaces can be determined by means of neutral impact collision ion scattering spectroscopy. The energy resolution of the spectra is influenced by the energy loss straggling of the projectiles. Energy loss straggling is a measure of the width of the energy loss distribution of particles passing through matter. Knowledge of the energy loss straggling is especially important for determining concentration depth profiles of aqueous surfaces. Here it is shown that the energy loss in the gas phase and the energy loss distribution can be determined with a series of spectra taken at different vapor pressures of the aqueous solution. The projectiles used are 3 keV helium ions. The gas phase causes a shift of the spectra to lower energies and a broadening of the structure due to energy loss straggling. Both the energy loss in the gas phase and the energy loss straggling must be gauged in order to determine concentration depth profiles quantitatively. Knowledge of the energy loss distribution can be used to determine accurate concentration depth profiles by means of deconvolution.},
doi = {10.1103/PHYSREVA.75.032901},
journal = {Physical Review. A},
number = 3,
volume = 75,
place = {United States},
year = {Thu Mar 15 00:00:00 EDT 2007},
month = {Thu Mar 15 00:00:00 EDT 2007}
}