Charge Density Waves: Q1D Metals & Transition Causes

LagrangeEuler
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I have one question. Charge density waves are usually defined as phase transitions on metal in which electrons started to behave like collective. Is this happen always in quasi one dimensional metals? Also why this transition actually happens?
 
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Thread 'Instantaneous dipole moment and orbitals'

Hi. I have got question as in title. How can idea of instantaneous dipole moment for atoms like, for example hydrogen be consistent with idea of orbitals? At my level of knowledge London dispersion forces are derived taking into account Bohr model of atom. But we know today that this model is not correct. If it would be correct I understand that at each time electron is at some point at radius at some angle and there is dipole moment at this time from nucleus to electron at orbit. But how...
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