(Color) Experimental schematic of the femtosecond sum frequency spectrometer.
Profile of a generated SF light from a clean Au surface having FWHM.
SF spectra of decane are shown for every (top); composite (red) and boxed averaged (, black) spectra of decane. The blue traces at the bottom spectrum are calculated fits to the methyl and methylene symmetric stretch bands ( and ). The intensity of each IR window was constant (to within ) for each individual VSF spectrum. Data were acquired under polarization conditions.
Molecular structure of three selected alkanes.
SSP spectra of alkanes with increasing chain length from top to bottom.
SPS spectra of selected alkanes.
(Color) Schematic representation of and transition moments and their projection onto plane.
(Color) Plot of with respect to chain length. The green and blue lines represent predicted behavior based on and statistical models, respectively, as described in text.
Properties of the samples used during this work. Surface tension measurements are carried out in our laboratory and consistent with the reported results in Refs. 65 and 66.
Laser powers and pulse widths for the femtosecond sum frequency spectrometer shown in Fig. 1.
and intensity ratios and ratios estimated from a radius of gyration model and from a statistical lattice model. Experimental ratios are determined from integrated intensities of and resulting from the fitting procedure described in the text.
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