TY - JOUR
T1 - Optical constants of the noble metals determined by reflection electron energy loss spectroscopy
AU - Ingram, Jani C.
AU - Nebesny, Kenneth W.
AU - Pemberton, Jeanne E.
N1 - Funding Information:
The authors are grateful for support of this work by the National Science Foundation (CHE-8614955) and the Materials Characterization Program of the State of Arizona. One of us (J.C.I) would also like to thank AT & T Bell Laboratories for fellowship support.
PY - 1990
Y1 - 1990
N2 - The optical constants for Cu, Ag, and Au determined by reflection electron energy loss spectroscopy (REELS) using a data treatment method described in the previous paper in this Journal are reported. The purpose of this study is to further test the data treatment method on less free-electron-like metals. The method involves removal of surface effects by deconvolution of data taken with low-energy electrons (200 eV) from data taken with higher energy electrons (1500 eV). The low- and high-energy electron experimental spectra are discussed along with the resulting optical constants. It is found that, although the surface loss contribution to the high-energy electron data is not readily apparent, its contribution does affect the results of the Kramers-Kronig analysis used to determine the complex dielectric function. Thus, some account must taken of the surface loss contribution in order to obtain quantitative information about the optical constants. Along with surface effects, plural-scattering contributions to the spectral response are also removed using deconvolution procedures. Comparison of these results to literature values demonstrates that the data treatment method is successful in closely approximating the optical constants for Cu, Ag, and Au.
AB - The optical constants for Cu, Ag, and Au determined by reflection electron energy loss spectroscopy (REELS) using a data treatment method described in the previous paper in this Journal are reported. The purpose of this study is to further test the data treatment method on less free-electron-like metals. The method involves removal of surface effects by deconvolution of data taken with low-energy electrons (200 eV) from data taken with higher energy electrons (1500 eV). The low- and high-energy electron experimental spectra are discussed along with the resulting optical constants. It is found that, although the surface loss contribution to the high-energy electron data is not readily apparent, its contribution does affect the results of the Kramers-Kronig analysis used to determine the complex dielectric function. Thus, some account must taken of the surface loss contribution in order to obtain quantitative information about the optical constants. Along with surface effects, plural-scattering contributions to the spectral response are also removed using deconvolution procedures. Comparison of these results to literature values demonstrates that the data treatment method is successful in closely approximating the optical constants for Cu, Ag, and Au.
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U2 - 10.1016/0169-4332(90)90086-F
DO - 10.1016/0169-4332(90)90086-F
M3 - Article
AN - SCOPUS:0025440771
SN - 0169-4332
VL - 44
SP - 293
EP - 300
JO - Applied Surface Science
JF - Applied Surface Science
IS - 4
ER -