Acrobat PDFMaker 10.0 for Word 17 0 obj /TT1 35 0 R The new technique of differential reflectometry was applied to study some fundamental corrosion processes for copper. Alloys with higher aluminum content yielded differential reflectograms with comparatively little structure. /Annots [23 0 R 24 0 R] A generalization of the Green's-function method (proposed by the authors in a previous paper) has been used to determine the energy bands of disordered Cu3Au. Finally, the sharp rise in the optical absorption, which on the basis of the theoretical E(k) corresponds to the onset of interband transitions between the d bands and the Fermi level, is found to occur at an energy in good accord with experiment. endobj A study of the optical absorption of Ni-based dilute alloys (NiCo, NiFe, NiV, NiTi) by a sensitive differential technique is presented. are beginning to reach a regime where the species can be Surprisingly the reaction occurred at much lower temperature (240 °C) than the m.p. null null 249 0 R null null null 250 0 R null null null 19 0 obj << endobj /CS5 [/ICCBased 45 0 R] >> The band calculation reveals that ordered AuCu3 has distinct copper and gold d bands positioned in and hybridizing with an s band common to copper and gold. 0000010077 00000 n 254 50 0 R] Detailed line shape analysis allows accurate determination of the shifts of the Fermi surface and of several of the relevant electronic levels at the point L of the Brillouin zone for both alloys. 0000105326 00000 n << /CropBox [0.0 0.0 595.32 841.92] Since each material has a specific electron-band structure the measurement of the characteristic energies for electron “interband transitions” serves as a means for identifying these materials. 227 0 R null null null 127 0 R 128 0 R 129 0 R] Ion implantation damage and post‐implantation annealing behavior of silicon (100) wafers have been studied, applying differential reflectometry as the principal investigative tool. >> Because this type of measurement can be made without contacting the sample, it is a powerful … <> Specifically, the instrument allows the exact measurement of the energies, which electrons absorb from photons as they are raised into a higher, allowed energy states. 28 0 obj The measurements are fast: a complete differential reflectogram, that is, an automatic scan from the UV through the visible into the IR region, is accomplished A study of the optical absorption of NiCu alloys for Cu concentrations from 2 to 13 at.% by a sensitive differential technique is presented. The results are discussed in terms of the available experimental information for this alloy. /CS0 [/ICCBased 33 0 R] /Contents [25 0 R 26 0 R 27 0 R 28 0 R 29 0 R 30 0 R 31 0 R 32 0 R] 9 0 obj 0000069356 00000 n The smoothed spectrum is in good agreement with the experimental spectrum above 4 eV. <> << x�3R��2�35W(�*T0P�R0T(�Y@���@QC= P A�J��� �1Vp�W� endobj We have found that the second principal maximum in ε2 for ordered Cu3Au is located at 3.28 eV, in contrast to 3.6 eV in the earlier measurements of Nilsson and Norris. 15 0 obj %PDF-1.5 Both models involve a single free parameter whose value is adjusted to guarantee agreement with the experimental shift in the optical-absorption edge as a function of Zn concentration. /Contents 62 0 R /K [66 0 R 67 0 R 68 0 R 69 0 R 70 0 R 71 0 R 72 0 R 73 0 R 74 0 R 75 0 R Experimental optical data on alloys that utilize silver and aluminium as base metals are summarized. The calculated masses are all somewhat lower (by about 10-30%) than the corresponding measured masses. Pseudopotential form factors and band structures are determined for 14 semiconductors of the diamond and zincblende structures: AlSb, CdTe, GaAs, GaP, GaSb, Ge, InAs, InP, InSb, Si, Sn, ZnS, ZnSe, and ZnTe. The optical spectrum of Cu is calculated in the random-phase approximation. /InlineShape /Figure This differential technique is highly sensitive and provides spectroscopic data of explosives. null null null 231 0 R null null null 139 0 R 140 0 R 141 0 R /TT1 35 0 R 13 0 obj 5 [null null null 236 0 R null null null null 237 0 R null endstream endobj (450 °C) of Te0. Download as PDF. /ColorSpace << >> Cu-21.4% Zn alloys (yellow brass) showed dezincification in less than one hour potentiostating time at pH ∼4 and minus 105 mVSHE (minus 350 mVSCE). /XObject << Three distinct regimes of the recrystallization process have been identified. <> /StructParents 5 Piezooptical response associated with the interconduction band transitions in the noble metals, Differential Reflectance Studies of Structural Changes in GaAs Caused by Ar+ Ion Bombardment, Optical Studies of Dezincification in Alpha-Brass, Laser‐ and Optical‐Based Techniques for the Detection of Explosives, Optical Reflectivity Measurements on Alloys by Compositional Modulation, Compositional modulation of CuZn, CuAl and CuNi alloys, CONDUCTIVITY AND HALL CONSTANT. The differential reflectograms of specific alloys whose compositions were in different fields of the phase diagram were found to have recognizable and characteristic line shapes. >> The measured spectra are interpreted in terms of the interband absorption calculated from an ab initio band structure obtained by the relativistic linear muffin-tin orbitals method. <> Theory, Color identification of iron oxides and hydroxysulfates : Use and limitations. /Type /Page Reflectance spectroscopy from TiO 2 particles embedded in polyurethane . null null 91 0 R 92 0 R 193 0 R 194 0 R 195 0 R 196 0 R 197 0 R 198 0 R <> stream produces in turn differential reflection spectra taken from these two adjacent areas on the surface. >> 0000023429 00000 n /ColorSpace << /StructParents 1 0000029709 00000 n endstream Schematic diagram of the geometry used in deriving the bidirectional reflectance. Two different oxides could be identified which were formed during immersion of the samples in an electrolyte while applying various potentials to them. /Author (Visweswara Chakravarthy Gudla) null 230 0 R null null null 133 0 R 134 0 R 135 0 R 136 0 R 137 0 R /TextBox /Art 76 0 R 77 0 R 78 0 R 79 0 R 80 0 R 81 0 R 82 0 R 83 0 R 84 0 R 85 0 R endobj 2 0 obj � ��� A computer processes the data and 256 0 R null null null null 257 0 R 258 0 R null null] <>/Group <> The experiment is analyzed for the difference in the optical conductivity between the alloy and pure Ni. /Parent 3 0 R The "masses" defined in terms of the cyclotron resonances for various orbits on the Fermi surface, the lowtemperature electronic specific heat, and the dielectric constant in the infrared region are determined for the calculated E(k). stream The spectral dependence of the normalized difference in reflectivity is obtained by periodically scanning monochromatic light across a pair of GaAs samples. The optical energy differences and oscillator strengths have been computed from a Monte Carlo sample of 2716 independent points distributed throughout the Brillouin zone. /Type /Page /CS0 [/ICCBased 33 0 R] Adobe PDF Library 10.0 �I�r,�m���\�0�Z�`R�]��i�U��}��7�ʡ2���k�>->�.���溫�����k��}����q�U��Tʒ%�R�,O,bPä'���(��({���ܧ�+:#M=�֚m���W�>�EW�ӕ���� ��>�;� �i

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