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Surface vibrational structure at alkane liquid/vapor interfaces
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Image of FIG. 1.
FIG. 1.

(Color) Experimental schematic of the femtosecond sum frequency spectrometer.

Image of FIG. 2.
FIG. 2.

Profile of a generated SF light from a clean Au surface having FWHM.

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

Molecular structure of three selected alkanes.

Image of FIG. 5.
FIG. 5.

SSP spectra of alkanes with increasing chain length from top to bottom.

Image of FIG. 6.
FIG. 6.

SPS spectra of selected alkanes.

Image of FIG. 7.
FIG. 7.

(Color) Schematic representation of and transition moments and their projection onto plane.

Image of FIG. 8.
FIG. 8.

(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.


Generic image for table
Table I.

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.

Generic image for table
Table II.

Laser powers and pulse widths for the femtosecond sum frequency spectrometer shown in Fig. 1.

Generic image for table
Table III.

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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Surface vibrational structure at alkane liquid/vapor interfaces