Vibrational band fractions vibration coupling

Figure 11 2 3. Band structure of MgB2 calculated for the distorted geometry. The displacement of B atoms is f = 0.005/atom (fraction unit) that correspond to 0.032 A0 of B1-B2 bond length elongation for stretching vibration (E2g(a) phonon mode amplitude). At this displacement, the lower splitoff c band has just sank below EF. The Fermi level - EF is indicated by the dashed line. The band structure calculations indicate that dominant is Oi-G2 and Gi-71 bands coupling over the E2g phonon mode...

$Figure 11 2 3. Band structure of MgB2 calculated for the distorted geometry. The displacement of B atoms is f = 0.005/atom (fraction unit) that correspond to 0.032 A0 of B1-B2 bond length elongation for stretching vibration (E2g(a) phonon mode amplitude). At this displacement, the lower splitoff c band has just sank below EF. The Fermi level - EF is indicated by the dashed line. The band structure calculations indicate that dominant is Oi-G2 and Gi-71 bands coupling over the E2g phonon mode...$

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