Interpreting spectra is one of the main challenges due to complex lineshape and spectral congestion in multicomponent systems. For example, when analyzing a mixture, the resulting spectra provide an average of all vibrational modes across different species, making it difficult to separate and identify individual contributions . Isotope labeling can be used to isolate individual species provided that the labeled species are present at high concentrations. In addition, interfacespecific spectra can be difficult to interpret as coupling and delocalization make vibrational assignments difficult, even for well-defined interfaces such as the air-water interface .