by Dallera, C, DeMichelis, B, Puppin, E and Braicovich, L and Brookes, NB
Abstract:
The electronic states of the theta’ phase formed by thermal aging in the Al-Cu (0.5 at. %) alloy are compared with those in C16-CuAl2, which is the final phase separated at equilibrium. This is done by means of Cu L(alpha) fluorescence spectroscopy. The high brilliance of undulator radiation used as an excitation source is exploited. The spectra are taken using the first harmonic of the undulator at 1.7 keV, with a full width half maximum of similar to 250 eV. A narrowing of around 0.5 eV of the Cu L(alpha) spectra in the theta’ phase is found. This is explained in terms of the differences in the Cu Sd-Cu 3d interaction in the two phases and of the hybridization between Cu 3d and the nearly free-electron-like electrons. The results demonstrate the future possibilities of fluorescence spectroscopy of minority species in inhomogeneous systems.
Reference:
Electronic states of the theta’ phase in Cu-Al alloys as compared to C16-CuAl2: Cn L alpha emission excited directly by undulator radiation (Dallera, C, DeMichelis, B, Puppin, E and Braicovich, L and Brookes, NB), In PHYSICAL REVIEW B, AMERICAN PHYSICAL SOC, volume 53, 1996.
Bibtex Entry:
@article{ ISI:A1996TU29000003, Author = {Dallera, C and DeMichelis, B and Puppin, E and Braicovich, L and Brookes, NB}, Title = {{Electronic states of the theta' phase in Cu-Al alloys as compared to C16-CuAl2: Cn L alpha emission excited directly by undulator radiation}}, Journal = {{PHYSICAL REVIEW B}}, Year = {{1996}}, Volume = {{53}}, Number = {{3}}, Pages = {{965-968}}, Month = {{JAN 15}}, Abstract = {{The electronic states of the theta' phase formed by thermal aging in the Al-Cu (0.5 at. %) alloy are compared with those in C16-CuAl2, which is the final phase separated at equilibrium. This is done by means of Cu L(alpha) fluorescence spectroscopy. The high brilliance of undulator radiation used as an excitation source is exploited. The spectra are taken using the first harmonic of the undulator at 1.7 keV, with a full width half maximum of similar to 250 eV. A narrowing of around 0.5 eV of the Cu L(alpha) spectra in the theta' phase is found. This is explained in terms of the differences in the Cu Sd-Cu 3d interaction in the two phases and of the hybridization between Cu 3d and the nearly free-electron-like electrons. The results demonstrate the future possibilities of fluorescence spectroscopy of minority species in inhomogeneous systems.}}, Publisher = {{AMERICAN PHYSICAL SOC}}, Address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}}, Type = {{Article}}, Language = {{English}}, Affiliation = {{Dallera, C (Corresponding Author), POLITECN MILAN,IST NAZL FIS MAT,PIAZZA LEONARDO DA VINCI 32,I-20133 MILAN,ITALY. POLITECN MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. EUROPEAN SYNCHROTRON RADIAT FACIL,F-38043 GRENOBLE,FRANCE.}}, DOI = {{10.1103/PhysRevB.53.965}}, ISSN = {{0163-1829}}, Keywords-Plus = {{AUGER-SPECTRA; SYNCHROTRON-RADIATION; DESIGN; COPPER}}, Research-Areas = {{Materials Science; Physics}}, Web-of-Science-Categories = {{Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter}}, ResearcherID-Numbers = {{Brookes, Nicholas B/C-6718-2019 }}, ORCID-Numbers = {{Brookes, Nicholas B/0000-0002-1342-9530 Braicovich, Lucio/0000-0001-6548-9140}}, Number-of-Cited-References = {{26}}, Times-Cited = {{3}}, Usage-Count-Last-180-days = {{0}}, Usage-Count-Since-2013 = {{1}}, Journal-ISO = {{Phys. Rev. B}}, Doc-Delivery-Number = {{TU290}}, Unique-ID = {{ISI:A1996TU29000003}}, DA = {{2020-12-22}}, }
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