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p-Ar collisions are investigated theoretically and experimentally at impact energies in the keV regime. Total cross sections for double electron capture of p on Ar are calculated by an independent-particle method in the impact energy range 3 -100 keV. We have measured the absolute differential and total cross sections for double electron capture for 1.0-5.0-keV p-Ar collisions. The absolute differential cross section ͑DCS͒ for all the collision energies considered shows a decreasing behavior with increasing angle, exhibiting an overall decrease of three orders of magnitude. The integrated DCS is found to be between the range of 0.7ϫ 10 −2 and 4.5ϫ 10 −2 Å 2 , displays an increasing behavior as a function of the incident energy, and merges with previous data at the high-energy side. The theoretical total cross sections reproduce the structures around 5 keV and 15 keV reported by other available measurements. The analysis of the capture into the 1s 1 4s 1 hydrogen-like configuration points in the direction of a common origin for these peaks.

An amide, namely N-[2-[(2-hydroxyethyl) amino] ethyl]-amide, extracted from the fatty acids contained in the coffee bagasse, has been investigated as a possible green corrosion inhibitor for copper in 3.5% NaCl by using potentiodynamic polarization curves and electrochemical impedance spectroscopy measurements. Results were complemented by detailed scanning electronic microscopy, FTIR and gas chromatography studies. Results have shown that N-[2-[(2hydroxyethyl) amino] ethyl]-amide is a good, mixed type of corrosion inhibitor, with an efficiency that increases with its concentration but it decreases with a rise in the temperature. It adsorbs chemically onto the copper surface by following a Langmuir type of adsorption isotherm.

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Total as well as partial cross sections for single-electron capture of H ϩ on Ar are calculated by the semiclassical impact parameter method, using a two-center atomic basis expansion, in the impact energy range 10-150 keV. The resulting total cross sections are in good agreement with previous experimental data. Partial cross sections agree qualitatively with measurements at high energies, while at low energies the experimental data are found to be approximately six times smaller than the present results.

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