Abstract
By means of the ab initio calculation, the second-order nonlinear derivatives of the dipole moment and polarizability of a dimer, CO⋯HCl, with respect to the two, CO and HCl, stretching modes are found to be inversely proportional to r3, where r is the intermolecular distance. The observed r-dependencies are interpreted by taking into account the dipole–induced-dipole interaction. Thus, it is shown that the intermolecular distance between two vibrational chromophores can be estimated by quantitatively examining the cross-peak intensity in a given 2D (two dimensional) vibrational spectrum.
Published Version
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