TWO-PHOTON SPECTROSCOPY OF SURFACE SPECIES
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Date
1984
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
Resonant second harmonic generation and fluorescence-detected two-photon absorption in an optical waveguide geometry provide a means of obtaining the two-photon spectrum of interfacial species. If two isotropic media are in contact, then the second harmonic signal is generated only at the interface and, hence, is interface or surface-specific. Spectra of molecules adsorbed onto $SiO_{2}$ and ZnO surfaces from gas and liquid phases have been obtained by detecting the second harmonic frequency in resonance with the electronic transitions. The evanescent field of a dye laser beam propagating through a planar waveguide can be used for two-photon excitation spectroscopy of species on the waveguide surface. Spectra of molecules hydrogen-bonded to $SiO_{2}$ and ZnO surfaces have been observed.
Description
Author Institution: Department of Chemistry, University of Arizona