Does "quadrupole" (Quadrupole-dipole), related to "Electrodynamic mechanism in SERS (in the case of, either noble metal nanoparticles or semiconducting nanoparticles)
The second half of your question seems to be missing.
However, in good Raman spectroscopy simulation tools, quadrupole-dipole scattering (NOT absorption) processes can be included in the calculation, see
https://www.sciencedirect.com/science/article/abs/pii/S0301010408000621
Article Quantum Chemical Calculation of Vibrational Spectra of Large...
and other works by the Reiher group.
However, SERS is often not accompanied by its own simulation at all, but in principle you could do that.
Thanks, Jürgen Weippert for correcting me and suggestion, I will go through the articles. The second half question is, can we experimentally see the "quadrupole-dipole scattering" (the Raman band that can have a spectral resolution)? and
Why the contributions of nuclear transition are neglected, experimentally, in the near field (electric field gradient)?
OK, about the "can we see it" part: the quadrupole-dipole part makes a band of a Raman spectrum more intense or may even show vibrations which are otherwise forbidden, but it does not create new vibrational modes.
I'm not sure what you mean with neglecting nuclear transitions, nuclear transitions are excited with gamma rays in Mößbauer spectroscopy which is way beyond the energy of any existing laser.
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