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Because FEELS records the energy spectra of all bands in the range studied, we were able to monitor the temporal evolution of the peak at the laser energy (3 to 5 eV, t, 0, and compare with that of the bulk plasmon peak (at 26.9 eV, A definite shift (∼150 fs) for the latter was observed in two different specimens. With least-squares analysis (rise and decay) we determined the decay of the low-energy band and the rise of the higher-energy band to be ∼180 fs. In previous reports (16, 22) the time zero was relative, reflecting the point when the intensity increases (decreases, whereas in this study the time zero was determined from the behavior of the 3 to 5 eV region at the initial excitation, Thus, all data are analyzed here with this determined value
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Because FEELS records the energy spectra of all bands in the range studied, we were able to monitor the temporal evolution of the peak at the laser energy (3 to 5 eV), t = 0, and compare with that of the bulk plasmon peak (at 26.9 eV). A definite shift (∼150 fs) for the latter was observed in two different specimens. With least-squares analysis (rise and decay) we determined the decay of the low-energy band and the rise of the higher-energy band to be ∼180 fs. In previous reports (16, 22) the time zero was relative, reflecting the point when the intensity increases (decreases), whereas in this study the time zero was determined from the behavior of the 3 to 5 eV region (at the initial excitation). Thus, all data are analyzed here with this determined value.
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S. Y. Savrasov, A. Kristallogr. 220, 555 (2005).
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S. Y. Savrasov, A. Kristallogr. 220, 555 (2005).
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This work was supported by the National Science Foundation and the Air Force Office of Scientific Research in the Gordon and Betty Moore Center for Physical Biology at the California Institute of Technology. We thank B. Barwick for helpful and stimulating discussion
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This work was supported by the National Science Foundation and the Air Force Office of Scientific Research in the Gordon and Betty Moore Center for Physical Biology at the California Institute of Technology. We thank B. Barwick for helpful and stimulating discussion.
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