Understanding the Absence of [001] Diffraction Peak in X-Ray Diffraction

rocksalt
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I know it is a simple question but I cannot find the answer. Why is the [001] diffraction peak not observed in XRD but [004] peak is observed. Thank you.
 
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Your statement is not generally true (though it is true for simple crystal systems like the BCC, FCC, diamond cubic, etc). But in any case, you need to look up the section on Structure Factor in your XRD textbook.
 

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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