# Section 8.1 of Chapter 8 will show that we can write an imaginary part of the energy of an electron

## Question:

Section 8.1 of Chapter 8 will show that we can write an imaginary part of the energy of an electron state, corresponding to h̄/τ, where τ is the time to scatter out of that state. Put in E_{c} − iΓ for the conduction state energy in (7.4.9), and show that in this case the susceptibility has the same form as that of the classical damped oscillator, found in Section 7.1, in the limit of Γ ≪ ω_{0}.

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Chapter #

**7**Section: Exercise 7.4

Problem: 2

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