Determining the Orientation of Chemical Functional Groups on Metal Surfaces by a Combination of Homodyne and Heterodyne Nonlinear Vibrational Spectroscopy

dc.contributor.authorYang, Wei-Chen
dc.contributor.authorHore, Dennis K.
dc.date.accessioned2020-01-04T18:42:47Z
dc.date.available2020-01-04T18:42:47Z
dc.date.copyright2017en_US
dc.date.issued2017
dc.description.abstractWe illustrate how phase-sensitive sum-frequency generation spectroscopy may be used to determine the polar orientation of organic species on metals, where there is a significant electronic contribution to the second-order signal. It turns out that traditional direct heterodyne schemes, as would be applied to the same molecules on dielectric substrates, are challenging to use here as a result of the large resonant/nonresonant amplitude ratio that diminishes the phase contrast observed in tuning through the vibrational mode. This is demonstrated in a variety of experimental surfaces that illustrate all limiting cases. We propose a scheme that can overcome this challenge and thereby determine the chemical functional group orientation through a combination of the homodyne spectrum and some phase information from a heterodyne approach.en_US
dc.description.reviewstatusRevieweden_US
dc.description.scholarlevelFacultyen_US
dc.description.sponsorshipWe thank the Natural Sciences and Engineering Research Council of Canada (NSERC) for support of this science with a Discovery Grant and Imperial Oil for a University Research Award. NSERC in partnership with Imperial Oil provided funding with a Collaborative Research and Development grant. We thank Dr. Bryce McGarvey at Imperial Oil for helpful discussion on the general topic of metal surface–surfactant interactions. Chris Secord and Jeff Trafton in the Faculty of Science Machine Shop provided assistance and advice on polishing the aluminum samples.en_US
dc.identifier.citationYang, W. & Hore, D. K. (2017). Determining the orientation of chemical functional groups on metal surfaces by a combination of homodyne and heterodyne nonlinear vibrational spectroscopy. The Journal of Physical Chemistry C, 121(50), 28043- 28050. DOI: 10.1021/acs.jpcc.7b09730en_US
dc.identifier.urihttps://doi.org/10.1021/acs.jpcc.7b09730
dc.identifier.urihttp://hdl.handle.net/1828/11454
dc.language.isoenen_US
dc.publisherThe Journal of Physical Chemistry Cen_US
dc.subjectMetalsen_US
dc.subjectNonlinear opticsen_US
dc.subjectOscillationen_US
dc.subjectPolarity Alkylsen_US
dc.titleDetermining the Orientation of Chemical Functional Groups on Metal Surfaces by a Combination of Homodyne and Heterodyne Nonlinear Vibrational Spectroscopyen_US
dc.typePostprinten_US

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