Absence of quantum interference theory

The experimental evidence, then, suggests that quantum interference is absent in liquid metals. At first sight this might seem to contradict Ziman s (1961) theory of liquid metals, in which waves scattered by different atoms do interfere this, however, is not so. Following arguments of Baym (1964), Greene and Kohn (1965) and Faber (1972), one should not use in that theory the Fourier transform S(k) of the instantaneous pair-distribution function, but rather 

An alternative explanation is given by Mott and Kaveh (1990). The work of Afonin et al (1987) has already been mentioned, showing that quantum interference is not incompatible with inelastic scattering if the energy loss is small. Mott and Kaveh (1990), in a paper appearing too late for full discussion here, show that to explain its absence in liquids one has to suppose that the path shown in Fig. 1.23 includes many collisions. 

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