Kittel Ch 8: Understanding Split-off Band, Longitudinal & Transverse Mass

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Homework Statement


This question refers to Kittel's solid-state physics book.

I am confused the split-off band, the longitudinal mass, and the transverse mass that Kittel starts talking about on page 202 in the section about Silicon and Germanium.
Can explain what these terms mean? Thanks.

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The Attempt at a Solution

 
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At a guess (I don't have the book), longitudinal mass is the effective mass of longitudinal waves and similarly for transverse mass.
 

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