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Electron energy-loss spectroscopy study of MgH2 in the plasmon energy range
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Image of FIG. 1.
FIG. 1.

The EELS spectrum of MgH2 before and after the deconvolution showing the peak of the profiles at 14.8 ± 0.1 eV. A small shoulder at ∼30 eV in the EELS before deconvolution is due to plural scattering. This peak disappears after deconvolution. (Inset) The ZLP of the spectrum. The energy resolution of the spectrum, defined as the FWHM of the ZLP, is ∼1 eV.

Image of FIG. 2.
FIG. 2.

Real part (ɛ1) of the dielectric function of MgH2. The energy at which ɛ1 passes through zero with positive slope, termed as Eɛ1 = 0, is 10.34 eV (shown by the arrow).

Image of FIG. 3.
FIG. 3.

The imaginary part (ɛ2) of dielectric function of MgH2. The major peaks in ɛ2 are shown by arrows at (a) 2.4 ± 0.1 eV, (b) 4.3 ± 0.1 eV, (c) 5.7 ± 0.1 eV, and (d) 6.15 ± 0.1 eV.

Image of FIG. 4.
FIG. 4.

Dielectric functions Re(1/ɛ) and Im(−1/ɛ) of MgH2. Energy-loss function Im(−1/ɛ) has the maximum at energy Emax observed to be 11.17 eV with the FWHM (=ΔEp) 4 eV. These values, along with Eɛ1 = 0 (Fig. 2) are used in determining the unperturbed plasmon energy (see Table I).


Generic image for table
Table I.

Relationships and the parameters used in estimating unperturbed plasmon energy (Ep) of MgH2. The parameters Emax and ΔEp are shown in Fig. 4 while Eɛ1 = 0 is shown in Fig. 2.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Electron energy-loss spectroscopy study of MgH2 in the plasmon energy range