Instead, many-body dispersion affects are introduced via mutual (self-consistent) dipole screening of the atomic polarizabilities ᾱTS a , which are mapped onto a 3N atoms -dimensional quantum harmonic oscillator Hamiltonian. Eigenmodes of that Hamiltonian provide information about collective (multi-atom) contributions to dispersion. This approach was originally developed as an ad hoc, density-dependent dispersion correction for DFT, 122-124 using range separation to make sure that the model accounts for long-range dispersion only, and to avoid short-range polarization catastrophes, 149 while the XC functional is tasked with the description of short-range correlation effects including dispersion. For this reason, the model described above has been called "MBD@rsSCS", 4 meaning "range-separated self-consistent screening", although we will simply call it MBD.