Monolayer vibrational spectroscopy by infrared-visible sum generation at metal and semiconductor surfaces |
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| Institution: | 1. Key Laboratory of Science and Technology on Vacuum Technology and Physics, Lanzhou Institute of Physics, Lanzhou, Gansu 730010, China;2. Institute of Polymer Science and Engineering, College of Chemistry and Chemical Engineering, Lanzhou University, Gansu 730000, China;1. Centro de Investigaciones en Química Biológica de Córdoba, CIQUIBIC, UNC, CONICET, Departamento de Química Biológica, Fac. de Cs. Químicas, Universidad Nacional de Córdoba. Haya de la Torre y Medina Allende, Ciudad Universitaria, X5000HUA, Córdoba, Argentina;2. Departamento de Fundamentación Biológica, Facultad de Ciencias Agropecuarias, Universidad Nacional de Córdoba, Córdoba, Argentina.;1. Faculty of Foundry Engineering, AGH University of Science and Technology, 30-059 Krakow, Poland;2. Faculty of Chemistry, University of Warsaw, 02-093 Warsaw, Poland;3. Department of Organic Chemistry, Faculty of Chemistry, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland |
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| Abstract: | IR-visible sum generation spectroscopy, an interface-selective probe of molecular vibrations, is used to obtain vibrational spectra of molecular monolayers on metal and semiconductor surfaces. The spectra obey electric dipole selection rules: vibrational modes must be both Raman and infrared active to show sum frequency resonances. The orientation of molecules at the interface can be determined by interference between the resonant molecular signal and a substrate background signal. Sum generation is also observed at a buried interface in the absence of a dielectric discontinuity, suggesting uses at buried molecular structures such as polymer-polymer interfaces. |
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