  A complete empirical approach from known Raman and IR spectra is used to make
corrections to the bond additivity model for quantitative interpretation of Sum
Frequency generation Vibrational Spectra (SFG-VS) from molecular interfaces.
This empirical correction successfully addresses the failures of the simple
bond additivity model. This empirical approach not only provides new
understandings of the effectiveness and limitations of the bond additivity
model, but also provides a practical roadmap for its application in SFG-VS
studies of molecular interfaces.
