Sum rule comparison of narrowband and broadband sum frequency generation spectra and comparison with theory

What is it about?

Sum frequency generation in the phase-sensitive aspect provides the surface structure and dynamics in an amplitude-oriented manner. Recently, the experiments for the dangling OH bond of the water surface, which are measured by various arrangements of lasers, were reported by four papers and the differences between the results can be three-folds for the integrated amplitude (sum rule) of the dangling OH bond region. After correcting the experimental results according to the experimental arrangements and the data processing methodology, the agreement within the narrowband and broadband experimental groups converged within 1.1 when using the sum rule. Moreover, the agreement between experimental measurement and the theoretical calculation is converged within 1.3 for the sum rule with no adjustable parameters.

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