1,720,972 research outputs found
Shake-up Satellites In High Energy Auger Spectra Of The 4d Metals
No full textInterpretation of the satellites of the Cu L2,3M4,5M4,5 has involved considerable controversy in recent years. Reaching unambiguous conclusions is impeded by the contribution of Coster-Kronig (CK) transitions, requiring considerable experimental investigation before clarifying the relative roles of shake-up and CK processes. The L2,3M4,5M4,5 spectra of Ag, Pd and Rh excited by bremsstrahlung also have satellite features and manifest the following experimental systematics: both the L3 and L2 losses are displaced the same amount relative to their respective main peaks and their shapes are approximately the same; there seems to be little CK contribution; and comparison with alloy spectra indicate the intrinsic nature of the losses, consistent with energy loss measurements. We demonstrate that the satellite relative positions and lineshapes are consistent with the spectator vacancy interpretation, so that they appear to correspond basically to broadened, displaced "images" of the corresponding main spectra. It seems that the satellites are almost entirely caused by intra-atomic shake-up processes; the "image" nature of their lineshapes resembles that of extrinsic losses in other metals.357-358251254Kleiman, G.G., Landers, R., Nascente, P.A.P., De Castro, S.G.C., (1992) Phys. Rev. B, 46, p. 1970Mariot, J.-M., Ohno, M., (1986) Phys. Rev. B, 34, p. 2182Yoshii, K., Baba, Y., Sasaki, T.A., (1995) J. Electron Spectrosc., 72, p. 107Landers, R., Nascente, P.A.P., De Castro, S.G.C., Kleiman, G.G., (1992) J. Phys. Condens. Matter, 4, p. 5881Landers, R., Nascente, P.A.P., De Castro, S.G.C., Kleiman, G.G., (1993) Surf. Sci., 287-288, p. 802Kleiman, G.G., Landers, R., De Castro, S.G.C., Nascente, P.A.P., (1993) Surf. Sci., 287-288, p. 798Landers, R., Kleiman, G., De Castro, S.G.C., (1995) J. Electron Spectrosc., 72, p. 211Kleiman, G.G., Landers, R., De Castro, S.G.C., (1994) J. Electron Spectrosc., 68, p. 329Kleiman, G.G., Landers, R., De Castro, S.G.C., (1994) Phys. Rev. B, 49, p. 2753Lang, N.D., Williams, A.R., (1977) Phys. Rev. B, 16, p. 2408Kleiman, G.G., Landers, R., De Castro, S.G.C., Nascente, P.A.P., (1992) Phys. Rev. B, 45, p. 13899Kleiman, G.G., Landers, R., De Castro, S.G.C., Nascente, P.A.P., (1991) Phys. Rev. B, 44, p. 3383Kleiman, G.G., Landers, R., De Castro, S.G.C., Nascente, P.A.P., (1992) J. Vac. Sci. Technol. A, 10, p. 2839Kleiman, G.G., Landers, R., Nascente, P.A.P., De Castro, S.G.C., (1992) Phys. Rev. B, 46, p. 4405Kleiman, G.G., Landers, R., Nascente, P.A.P., De Castro, S.G.C., (1993) Surf. Sci., 287-288, p. 794Kleiman, G.G., (1993) J. Phys. Condens. Matter, 5, p. 1Kleiman, G.G., Landers, R., De Castro, S.G.C., Rogers, J.D., (1991) Phys. Rev., 644, p. 8529Kleiman, G.G., (1982) Appl. Surf. Sci., 11-12, p. 730Nascente, P.A.P., De Castro, S.G.C., Landers, R., Kleiman, G.G., (1991) Phys. Rev. B, 43, p. 4659Wagner, C.D., Taylor, J.A., (1980) J. Electron Spectrosc., 20, p. 83Sundaram, V.S., Rogers, J.D., Landers, R., (1981) J. Vac. Sci. Technol. A, 19, p. 117Condon, E.U., Shortley, G.H., (1963) The Theory of Atomic Spectra, , Cambridge University, LondonKleiman, G.G., Landers, R., De Castro, S.G.C., unpublishedLanders, R., Kleiman, G.G., De Castro, S.G.C., J. Electron Spectrosc., , in pressNyholm, R., Mårtensson, N., (1980) J. Phys. C, 13, pp. L279Mårtensson, N., Nyholm, R., (1981) Phys. Rev. B, 24, p. 7121noteMartensson, N., Johansson, B., (1983) Phys. Rev. B, 28, p. 3733Drube, W., Lessmann, A., Materlik, G., (1992) Jpn. J. Appl. Phys., 32, p. 17
Electronic Structure Information Of Metals And Alloys From Auger And Photoemission
No full textWe report some of the results of extensive experimental and theoretical studies by our group of the XPS and Auger spectra of the transition and noble metals and some of their alloys: we concentrate on those aspects of the spectra which regard the determination of electronic structure. Consideration of the Auger kinetic energies yields insight into screening mechanisms and suggests methods for extracting electronic structure changes in alloys from XPS and XAES shifts. We demonstrate that the charge transfer in a number of alloys (AuPd, CuPd, AgPd, AuCu, AgAu and CuNi) appears to be negligible (i.e., on the order of hundredths of electrons/atom). Examples (i.e., AuZn, AuMg, AuPd, AgPd and CuNi) of the results for the d- and sp-electron occupations are given. © 2004 Elsevier B.V. All rights reserved.2281-2 SPEC. ISS.137143Kleiman, G.G., Landers, R., (1998) J. Electron. Spectrosc. Relat. Phenom., 88-91, p. 435Kleiman, G.G., Landers, R., De Castro, S.G.C., (1995) J. Electron. Spectrosc. Relat. Phenom., 72, p. 199Kleiman, G.G., Landers, R., (1995) J. Electron. Spectrosc. Relat. Phenom., 76, p. 319Kleiman, G.G., (1982) 11/12 Appl. Surf. Sci., p. 730Kleiman George, G., (1995) Phys. Status Solidi B, 192, p. 503Kleiman, G.G., (1999) J. Electron. Spectrosc. Relat. Phenom., 100, p. 17Kleiman, G.G., (2002) J. Electron. Spectrosc. Relat. Phenom., 127, p. 53Lang, N.D., Williams, A.R., (1977) Phys. Rev. B, 16, p. 2408Lang, N.D., Williams, A.R., (1979) Phys. Rev. B, 20, p. 1369Kleiman, G.G., Landers, R., De Castro, S.G.C., Nascente, P.A.P., (1992) Phys. Rev. B, 45, p. 13899Kleiman, G.G., Landers, R., De Castro, S.G.C., Nascente, P.A.P., (1993) Surf. Sci., 287-288, p. 794Cini, M., (1977) Solid State Commun., 24, p. 681Cini, M., (1978) Phys. Rev. B, 17, p. 2486Sawatzky, G.A., (1977) Phys. Rev. Lett., 39, p. 504noteMårtensson, N., Johansson, B., (1980) Phys. Rev. Lett., 45, p. 482Mårtensson, N., Hedegard, P., Johansson, B., (1987) Phys. Scripta, 29, p. 154Mårtensson, N., Nyholm, R., Johansson, B., (1980) Phys. Rev. Lett., 45, p. 754Johansson, B., Mårtensson, N., (1980) Phys. Rev. B, 21, p. 4427Williams, A.R., Lang, N.D., (1978) Phys. Rev. Lett., 40, p. 954Kleiman, G.G., Landers, R., Nascente, P.A.P., De Castro, S.G.C., (1992) Phys. Rev. B, 46, p. 4405Kleiman, G.G., Landers, R., De Castro, S.G.C., Nascente, P.A.P., (1991) Phys. Rev. B, 44, p. 3383Kleiman, G.G., Landers, R., De Castro, S.G.C., Nascente, P.A.P., (1992) J. Vac. Sci. and Technol. a, 10, p. 2839Kleiman, G.G., De Castro, S.G.C., Rogers, J.D., Sundaram, V.S., (1982) Solid State Commun., 43, p. 257Rogers, J.D., Sundaram, V.S., Kleiman, G.G., De Castro, S.G.C., Douglas, R.A., Peterlevitz, A.C., (1982) J. Phys. F, 12, p. 2097Hohenberg, P., Kohn, W., (1964) Phys. Rev., 136, p. 864Kohn, W., Sham, L.J., (1965) Phys. Rev., 140, p. 113Thomas, T.D., Weightman, P., (1986) Phys. Rev. B, 33, p. 5406Gelatt Jr., C.D., Ehrenreich, H., (1974) Phys. Rev. B, 10, p. 398Mueller, F.M., (1967) Phys. Rev., 153, p. 659Kleiman, G.G., Landers, R., De Castro, S.G.C., Rogers, J.D., (1991) Phys. Rev. B, 44, p. 8529Nascente, P.A.P., De Castro, S.G.C., Landers, R., Kleiman, G.G., (1991) Phys. Rev. B, 43, p. 4659Landers, R., De Castro, S.G.C., Kleiman, G.G., (1994) J. Electron. Spectrosc. Relat. Phenom., 68, p. 145Winter, H., Durham, P.J., Temmerman, W.M., Stocks, G.M., (1986) Phys. Rev. B, 33, p. 2370Magri, R., Wei, S.H., Zunger, A., (1990) Phys. Rev. B, 42, p. 11388Johnson, D.D., Pinski, F.J., (1993) Phys. Rev. B, 48, p. 11553Cole, R.J., Gregory, D.A.C., Weightman, P., (1994) Phys. Rev. B, 49, p. 5657Cole, R.J., Matthew, J.A.D., Weightman, P., (1995) J. Electron. Spectrosc. Relat. Phenom., 72, p. 255Barbieri, P.F., De Siervo, A., Carazzolle, M.F., Landers, R., Kleiman, G.G., (2004) J. Electron. Spectrosc. Relat. Phenom., 135, p. 11
High-resolution LMN and LMM Auger spectra of Pd, Ag, In, Sn and Sb
No full textFAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOCNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFINEP - FINANCIADORA DE ESTUDOS E PROJETOSConsiderable interest in high-resolution Auger spectroscopy of the 4d metals has arisen because of the possibility of treating Auger spectroscopy as an excited state probe in order to extract new information regarding electronic structure. Auger transitions involving only core levels are interesting because current theories of line shapes and energies usually assume that the final core holes are either atomic or quasi-atomic. Comparison of the results of atomic calculations with experimental Auger spectra comprises a crucial test of the atomic theories. We present the results of high-resolution measurements of several high energy LMN and LMM Auger spectra of Pd, Ag, In, Sn and Sb excited with Ti Kα radiation. Assignments of the peaks are based upon energy and intensity considerations. We compare the experimental spectra with the results of atomic transition probability calculations, which indicates the reliability of such calculations as we proceed from open to closed 4d shell metals. © 1998 Elsevier Science B.V. All rights reserved.Considerable interest in high-resolution Auger spectroscopy of the 4d metals has arisen because of the possibility of treating Auger spectroscopy as an excited state probe in order to extract new information regarding electronic structure. Auger transitions involving only core levels are interesting because current theories of line shapes and energies usually assume that the final core holes are either atomic or quasi-atomic. Comparison of the results of atomic calculations with experimental Auger spectra comprises a crucial test of the atomic theories. We present the results of high-resolution measurements of several high energy LMN and LMM Auger spectra of Pd, Ag, In, Sn and Sb excited with Ti K? radiation. Assignments of the peaks are based upon energy and intensity considerations. We compare the experimental spectra with the results of atomic transition probability calculations, which indicates the reliability of such calculations as we proceed from open to closed 4d shell metals.Considerable interest in high-resolution Auger spectroscopy of the 4d metals has arisen because of the possibility of treating Auger spectroscopy as an excited state probe in order to extract new information regarding electronic structure. Auger transitions involving only core levels are interesting because current theories of line shapes and energies usually assume that the final core holes are either atomic or quasi-atomic. Comparison of the results of atomic calculations with experimental Auger spectra comprises a crucial test of the atomic theories. We present the results of high-resolution measurements of several high energy LMN and LMM Auger spectra of Pd, Ag, In, Sn and Sb excited with Ti Kα radiation. Assignments of the peaks are based upon energy and intensity considerations. We compare the experimental spectra with the results of atomic transition probability calculations, which indicates the reliability of such calculations as we proceed from open to closed 4d shell metals.7. International Conference on Electron Spectroscopy943253257FAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOCNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFINEP - FINANCIADORA DE ESTUDOS E PROJETOSFAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOCNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFINEP - FINANCIADORA DE ESTUDOS E PROJETOSSem informaçãoSem informaçãoSem informaçãoFuggle, J.C., (1981) Electron Spectroscopy, p. 85. , C.R. Brundle and A.D. Baker (Eds.), Academic Press, LondonWeightman, P., (1982) Rep. Prog. Phys., 45, p. 753Houston, J.E., Rye, R.R., (1983) Comments Solid State Phys., 10, p. 233Lundquist, S., Schrieffer, R., (1986) Phys. Scr., 34, p. 84Kleiman, G.G., (1982) Appl. Surf. Sci., 11-12, p. 730Landers, R., Nascente, P.A.P., De Castro, S.G.C., Kleiman, G.G., (1992) J. Phys.: Condens. Matter, 4, p. 5881Landers, R., Nascente, P.A.P., De Castro, S.G.C., Kleiman, G.G., (1993) Surf. Sci., 287-288, p. 802Kleiman, G.G., Landers, R., Nascente, P.A.P., De Castro, S.G.C., (1992) Phys. Rev. B, 46, p. 1970Kleiman, G.G., Landers, R., De Castro, S.G.C., (1994) Phys. Rev. B, 49, p. 2753Landers, R., Siervo, A., De Castro, S.G.C., Kleiman, G.G., J. Electron Spectrosc. Relat. Phenom., , in pressDrube, W., Grehk, T.M., Treusch, R., Materlik, G., (1998) J. Electron Spectrosc. Relat. Phenom., 88-91, p. 683Drube, W., Radiation Physics and Chemistry, , in pressGrehk, T.M., Drube, W., Materlik, G., Hansen, J.E., Sham, T.K., (1998) J. Electron Spectrosc. Relat. Phenom., 88-91, p. 241Powell, C.J., Erickson, N.E., Jach, T., (1981) J. Vac. Sci Technol., 20, p. 625Mårtensson, N., Nyholm, R., (1981) Phys. Rev. B, 24, p. 7121Wagner, C.D., Riggs, W.M., Davis, L.E., Moulder, J.F., (1979) Handbook of X-Ray Photoelectron Spectroscopy, , G.E. Muilenberg (Ed.), Perkin Elmer, Eden Prairie, MNBeardean, J.A., (1967) Rev. Mod. Phys., 39, p. 78Mann, J.B., (1967) Los Alamos Scientific Lab. Report. No LASL-3690McGuire, E.J., (1971) Sandia Lab. Report. No. SC-RR-710075Nyholm, R., Mårtensson, N., (1981) Solid State Commun., 40, p. 311Froese Fischer, C., (1977) The Hartree-Fock Method for Atoms, , Wiley, New YorkMariot, J.-M., Ohno, M., (1986) Phys. Rev. B, 34, p. 2182Chen, M.H., (1985) Phys. Rev. A, 31, p. 177De Siervo, A., Landers, R., De Castro, S.G.C., Kleiman, G.G., unpublished resultsKleiman, G.G., De Siervo, A., Landers, R., De Castro, S.G.C., unpublished resultsKleiman, G.G., Landers, R., De Castro, S.G.C., (1994) J. Electron Spectrosc. Relat. Phenom., 68, p. 329Kleiman, G.G., (1993) J. Phys.: Condens. Matter, 5, pp. A167Landers, R., De Castro, S.G.C., Kleiman, G.G., (1993) Surf. Sci. Spectra, 2, p. 177Landers, R., Kleiman, G.G., De Castro, S.G.C., (1995) J. Electron Spectrosc. Relat. Phenom., 72, p. 211Kleiman, G.G., (1995) Phys. Status Solidi B, 192, p. 503Landers, R., Kleiman, G.G., De Castro, S.G.C., (1995) J. Electron Spectrosc. Relat. Phenom., 76, p. 345Kleiman, G.G., Landers, R., De Castro, S.G.C., (1996) Surface Science, 357-358, p. 251Kleiman, G.G., Landers, R., Nascente, P.A.P., De Castro, S.G.C., (1993) Surf. Sci., 287-288, p. 798Sorensen, S.L., Carr, R., Schaphorst, S.J., Whitfield, S.B., Crasemann, B., (1989) Phys. Rev. A, 39, p. 6241Drube, W., Lessmann, A., Materlik, G., (1993) Jpn. J. Appl. Phys., 32, p. 173Drube, W., Treusch, R., Materlik, G., (1995) Phys. Rev. Lett., 74, p. 427. International Conference on Electron Spectroscopy08 a 12 de Setembro de 1997Chiba, Japã
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Photon energy and core hole lifetime dependences of Ag high energy Auger satellites
No full textFAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOCNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFINEP - FINANCIADORA DE ESTUDOS E PROJETOSUnderstanding metallic response to the presence of a dynamic, localized perturbation, such as a finite lifetime core hole, has been the theme of many studies. Although, in XPS of such metals as Ni and Pd, shake-up satellites are common, in Auger spectroscopy, an intrinsic laboratory of many-body effects, the most extensively studied metal, Cu, manifests LVV satellites which are associated with Coster-Kronig (CK) transitions. Unambiguously identified shake-up satellites have been observed in the L123M45M45 spectra of the 4d metals, studied with conventional X-ray sources and, in the L3 threshold region, with synchrotron radiation. There remain questions concerning the origin of these satellites and their relation to the corresponding XPS spectra. Here, we report a study of the Ag L23M45M45 spectra as a function of photon energy and demonstrate the evolution of the satellite spectra. The change of the satellite shapes with photon energy is directly related to the validity of the sudden approximation. Correlation of the satellite spectra with core level lifetime indicates the influence of core hole dynamics. From the experimental systematics, it becomes clear that isolation of CK effects is very difficult.Understanding metallic response to the presence of a dynamic, localized perturbation, such as a finite lifetime core hole, has been the theme of many studies. Although, in XPS of such metals as Ni and Pd, shake-up satellites are common, in Auger spectroscopy, an intrinsic laboratory of many-body effects, the most extensively studied metal, Cu, manifests LVV satellites which are associated with Coster-Kronig (CK) transitions. Unambiguously identified shake-up satellites have been observed in the L123M45M45 spectra of the 4d metals, studied with conventional X-ray sources and, in the L3 threshold region, with synchrotron radiation. There remain questions concerning the origin of these satellites and their relation to the corresponding XPS spectra. Here, we report a study of the Ag L23M45M45 spectra as a function of photon energy and demonstrate the evolution of the satellite spectra. The change of the satellite shapes with photon energy is directly related to the validity of the sudden approximation. Correlation of the satellite spectra with core level lifetime indicates the influence of core hole dynamics. From the experimental systematics, it becomes clear that isolation of CK effects is very difficult.Understanding metallic response to the presence of a dynamic, localized perturbation, such as a finite lifetime core hole, has been the theme of many studies. Although, in XPS of such metals as Ni and Pd, shake-up satellites are common, in Auger spectroscopy, an intrinsic laboratory of many-body effects, the most extensively studied metal, Cu, manifests LVV satellites which are associated with Coster–Kronig (CK) transitions. Unambiguously identified shake-up satellites have been observed in the L123M45M45 spectra of the 4d metals, studied with conventional X-ray sources and, in the L3 threshold region, with synchrotron radiation. There remain questions concerning the origin of these satellites and their relation to the corresponding XPS spectra. Here, we report a study of the Ag L23M45M45 spectra as a function of photon energy and demonstrate the evolution of the satellite spectra. The change of the satellite shapes with photon energy is directly related to the validity of the sudden approximation. Correlation of the satellite spectra with core level lifetime indicates the influence of core hole dynamics. From the experimental systematics, it becomes clear that isolation of CK effects is very difficult.14. International Vacuum Congress; 10. International Conference on Solid Surfaces; 5. International Conference on Nanometre-Scale Science and Technology; 10. International Conference on Quantitative Surface Analysis433878881FAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOCNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFINEP - FINANCIADORA DE ESTUDOS E PROJETOSFAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOCNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFINEP - FINANCIADORA DE ESTUDOS E PROJETOSSem informaçãoSem informaçãoSem informaçãoFuggle, J.C., (1981) Electron Spectroscopy, p. 85. , C.R. Brundle, A.D. Baker (Eds.), Academic, LondonWeightman, P., (1982) Rep. Prog. Phys., 45, p. 753Kleiman, G.G., (1982) Appl. Surf. Sci., 11-12, p. 730Mariot, J.-M., Ohno, M., (1986) Phys. Rev. B, 34, p. 2182Sorensen, S.L., Carr, R., Schaphorst, S.J., Whitfield, S.B., Crasemann, B., (1989) Phys. Rev. A, 39, p. 6241Drube, W., Treusch, R., Materlik, G., (1995) Phys. Rev. Lett., 74, p. 42Drube, W., Lessmann, A., Materlik, G., (1993) Jpn. J. Appl. Phys., 32, p. 173Drube, W., Treusch, R., Dähn, R., Griebenow, M., Grehk, M., Materlik, G., (1996) J. Electron Spectrosc. Relat. Phenom., 79, p. 223Drube, W., (1998) Rad. Phys. Chem., 51, p. 335Drube, W., Grehk, T.M., Treusch, R., Materlik, G., (1998) J. Electron Spectrosc. Relat. Phenom., 88-91, p. 683Grehk, T.M., Drube, W., Materlik, G., Hansen, J.E., Sham, T.K., (1998) J. Electron Spectrosc. Relat. Phenom., 88-91, p. 241Grehk, T.M., Drube, W., Treusch, R., Materlik, G., (1998) Phys. Rev. B, 57, p. 6422Landers, R., Nascente, P.A.P., De Castro, S.G.C., Kleiman, G.G., (1992) J. Phys.: Condens. Matter, 4, p. 5881Landers, R., Nascente, P.A.P., De Castro, S.G.C., Kleiman, G.G., (1993) Surf. Sci., 287-288, p. 802Kleiman, G.G., Landers, R., De Castro, S.G.C., (1994) J. Electron Spectroscopy Relat. Phenom., 68, p. 329Kleiman, G.G., Landers, R., De Castro, S.G.C., (1994) Phys. Rev. B, 49, p. 2753Landers, R., Kleiman, G.G., De Castro, S.G.C., (1995) J. Electron Spectroscopy Relat. Phenom., 72, p. 211Kleiman, G.G., (1995) Phys. Status Solidi (b), 192, p. 503Landers, R., De Castro, S.G.C., De Siervo, A., Kleiman, G.G., (1998) J. Electron Spectrosc. Relat. Phenom., 94, p. 253Landers, R., De Castro, S.G.C., De Siervo, A., Kleiman, G.G., (1998) J. Electron Spectrosc. Relat. Phenom., 93, p. 221Kleiman, G.G., Landers, R., Nascente, P.A.P., De Castro, S.G.C., (1992) Phys. Rev. B, 46, p. 1970Landers, R., Kleiman, G.G., De Castro, S.G.C., (1995) J. Electron Spectrosc. Relat. Phenom., 76, p. 345Kleiman, G.G., Landers, R., De Castro, S.G.C., (1996) Surf. Sci., 357-358, p. 251Kleiman, G.G., Landers, R., De Castro, S.G.C., De Siervo, A., (1998) Phys. Rev. B, 58, p. 16103De Siervo, A., Landers, R., De Castro, S.G.C., Kleiman, G.G., (1998) J. Electron Spectrosc. Relat. Phenom., 88-91, p. 429Gunnarsson, O., Schönhammer, K., (1980) Phys. Rev. B, 22, p. 371014. International Vacuum Congress; 10. International Conference on Solid Surfaces; 5. International Conference on Nanometre-Scale Science and Technology; 10. International Conference on Quantitative Surface Analysis31 de Agosto a 04 de Setembro de 1998Birmingham, InglaterraBritish Vacuum Council; Inst Phys; Int Union Vacuum Sci Tech & ApplicatBritish Vacuum Council; Inst Phys; Int Union Vacuum Sci Tech & ApplicatWe would like to thank FAPESP, CNPq, FINEP and LNLS of Brasil for support. Special thanks are due Dr Miguel Abbate of LNLS
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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