Can Intense Radiation Enhance Inverse Raman Effect and Multi Photon Absorption?

tyogav
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Why do we need the presence of an intense radiation in Inverse Raman Effect and Multi Photon Absorption?
 
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Well, to put it simply, it's because they are higher order processes in the sense that there are multiple photons being involved in the interaction simultaneously. If you have few photons (low intensity) the probability for multiple photons to interact simultaneously is low, but if you increase the photon number (higher intensity) multiple-photon interactions become statistically more likely.
 

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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