title: Heterodyne-detected electronic sum frequency generation: "up" versus "down" alignment of interfacial molecules.
abstract: Heterodyne-detected electronic sum frequency generation (HD-ESFG) spectroscopy is newly developed to obtain complex electronic chi(2) spectra of interfaces for a simultaneous detection bandwidth broader than 100 nm. HD-ESFG provides linear chi(2) spectra that have unambiguous information on the "up" versus "down" alignment of interfacial molecules. It is demonstrated for p-nitroaniline, a prototypical molecule of nonlinear optical materials, that the up versus down alignment at an air/fused silica interface is critically influenced by a fine modification of the molecule.
authors.affiliation: Molecular Spectroscopy Laboratory, RIKEN, 2-1 Hirosawa, Wako 351-0198, Japan.
authors.forename: Shoichi
authors.initials: S
authors.lastname: Yamaguchi
authors.forename: Tahei
authors.initials: T
authors.lastname: Tahara
mesh_terms: D000327:Adsorption; D000814:Aniline Compounds / Q000737:chemistry; D004583:Electrons; D005898:Glass / Q000737:chemistry; D009603:Nitroso Compounds / Q000737:chemistry; D013057:Spectrum Analysis; D013499:Surface Properties
chemical_list: D000814:Aniline Compounds; D009603:Nitroso Compounds; C013160:4-nitroso-N,N-diethylaniline; C019498:4-nitroaniline