Section 8.1 of Chapter 8 will show that we can write an imaginary part of the energy of an electron state, corresponding to h/, where

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 ≪ ω₀.

(v|y(t)) = 1, (c|(t)) = - 1 2ih (c\x{v} qEo [* dt' (exor of 'di' (eiot' + e-iot) ei(Ec-Ev)t'/h to (7.4.9)