Differential reflectometry and its application to the study of alloys, ordering, corrosion, and surface properties

Hummel, Rolf E.

doi:10.1002/pssa.2210760102

Cited by 53 publications

(22 citation statements)

References 76 publications

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“…The reflectance spectrum in this condition (Fig. 5) shows more intense absorbance peaks that, as above, can be attributed to Zn(II) compounds and to Cu 2 O [29,30]. Holding the potential at -0.1 V SCE it could be seen that the charge associated to the reduction of Cu 2 O (fig.4) is now higher.…”

Section: Resultsmentioning

confidence: 55%

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Brass corrosion in tap water distribution systems inhibited by phosphate ions

2011

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Section: Resultsmentioning

confidence: 55%

“…This technique is useful to identify changes produced between 50 and 100 atomic layers in a semi-transparent solid [29].…”

Section: Uv-visible Reflectance Spectroscopymentioning

confidence: 99%

Brass corrosion in tap water distribution systems inhibited by phosphate ions

2011

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“…The main spectral characteristic for zinc is a peak located at 230-250 nm. When the potential scan moved towards values more positive than -0.6 V, the main spectral features corresponded to those for Cu 2 O: a broad peak at 462 nm, a lower one at 240 and 360-380 nm, and a shoulder at 237 nm [4,5,9]. The presence of CuO in the film was evidenced by a featureless absorption band, increasing in intensity at wavelengths shorten than 280 nm.…”

Section: Characterization Of the Surfaces By Cyclic Voltammetrymentioning

confidence: 85%

“…The composition of the surface films was evaluated by means of reflectance spectroscopy [4]. The absorption spectra were recorded in-situ.…”

Section: Methodsmentioning

confidence: 99%

Oxygen reduction on Cu–Zn alloys

2008

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The reduction of oxygen on brass type Cu77Z-n21Al2 in contact with 0.1 mol L -1 borax at pH 9.2 with and without chlorides was investigated and compared with the results on spectroscopic Cu. The surface film was characterized in situ by means of reflectance spectroscopy and by electrochemical impedance in the potential range negative to the open circuit potential. The main parameters associated to the kinetics of the oxygen reduction reaction were analyzed with a rotating disc electrode. The results show that within the potentials studied, a porous film was formed on brass while no significant spectral features were observed, except at -1.2 V where zinc oxo-hydroxides grow in chloride-free solutions and dissolve when chlorides are present in the system. The number of electrons exchanged for brass was close to 4 in both solutions, showing that oxygen is predominantly reduced to hydroxyl ions, with a reaction order equal to one. The residual presence of oxides on the surface results in KouteckyLevich plots with slopes dependent on the applied potential and interfere with the calculation of the Tafel slope.

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“…The experimental setup for the DR measurements is the same as described in detail by Hummel [8,9]. Light is passed through a monochromator and scanned by means of an oscillating mirror between the damaged and the reference parts of the sample.…”

Section: Methodsmentioning

confidence: 99%

Differential Reflectance Studies of Structural Changes in GaAs Caused by Ar⁺ Ion Bombardment

Ludwig

Hummel

1993

MRS Proc.

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Differential reflection (DR) spectrometry has been used to investigate and characterize the effect of sputter damage of GaAs by Ar÷ ions. The DR technique provides the photon-induced critical point interband transition energies which are sensitive to the electron and the crystal structure. The spectral dependence of the normalized difference in reflectivity is obtained by periodically scanning monochromatic light across a pair of GaAs samples. In the present case one part has been damaged by Ar÷ ions with energies ranging from 500 to 5000 eV. The other half is the undamaged reference. The DR structure caused by interband transitions and designated as E, and E, + ,& were found to shift in energy with increasing ion beam energy or with sputter damage. Two annealing stages were observed, one at 200'C and the other between 400'C and 450'C. They were attributed to different recovering mechanisms of As Frenkel pairs.

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Differential reflectometry and its application to the study of alloys, ordering, corrosion, and surface properties

Cited by 53 publications

References 76 publications

Brass corrosion in tap water distribution systems inhibited by phosphate ions

Brass corrosion in tap water distribution systems inhibited by phosphate ions

Oxygen reduction on Cu–Zn alloys

Differential Reflectance Studies of Structural Changes in GaAs Caused by Ar⁺ Ion Bombardment

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Differential reflectometry and its application to the study of alloys, ordering, corrosion, and surface properties

Cited by 53 publications

References 76 publications

Brass corrosion in tap water distribution systems inhibited by phosphate ions

Brass corrosion in tap water distribution systems inhibited by phosphate ions

Oxygen reduction on Cu–Zn alloys

Differential Reflectance Studies of Structural Changes in GaAs Caused by Ar+ Ion Bombardment

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Differential Reflectance Studies of Structural Changes in GaAs Caused by Ar⁺ Ion Bombardment