Hyperpolarizabilities of Push-Pull Chromophores in Solution: Interplay between Electronic and Vibrational Contributions.

For instance, it is nowadays well established that the vibrational contributions to frequency-independent (static) hyperpolarizabilities can be as large as or even larger than their electronic counterparts [ 8 , 9 ], and the anharmonic effects might be significant even for weakly anharmonic systems [ 10 ], especially if the static or low-frequency dependent (e.g., in the IR region) electric fields are present in the NLO process of interest [ 8 , 11 ].

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