학술논문
High phase resolution: Probing interactions in complex interfaces with sum frequency generation.
Document Type
Academic Journal
Author
Shultz MJ; Laboratory for Water and Surface Studies, Tufts University, Pearson Laboratory, 62 Talbot Ave., Medford, Massachusetts 02155.; Bisson P; Cambridge Polymer Group, Inc., 100 Trade Center Drive, Suite 200, Woburn, Massachusetts 01801.; Wang J; Laboratory for Water and Surface Studies, Tufts University, Pearson Laboratory, 62 Talbot Ave., Medford, Massachusetts 02155.; Marmolejos J; Laboratory for Water and Surface Studies, Tufts University, Pearson Laboratory, 62 Talbot Ave., Medford, Massachusetts 02155.; Davies RG; Laboratory for Water and Surface Studies, Tufts University, Pearson Laboratory, 62 Talbot Ave., Medford, Massachusetts 02155.; Gubbins E; Laboratory for Water and Surface Studies, Tufts University, Pearson Laboratory, 62 Talbot Ave., Medford, Massachusetts 02155.; Xiong Z; Laboratory for Water and Surface Studies, Tufts University, Pearson Laboratory, 62 Talbot Ave., Medford, Massachusetts 02155.
Source
Publisher: AIP Publishing Country of Publication: United States NLM ID: 101275679 Publication Model: Print Cited Medium: Internet ISSN: 1559-4106 (Electronic) Linking ISSN: 15594106 NLM ISO Abbreviation: Biointerphases Subsets: MEDLINE
Subject
Language
English
Abstract
An often-quoted statement attributed to Wolfgang Pauli is that God made the bulk, but the surface was invented by the devil. Although humorous, the statement really reflects frustration in developing a detailed picture of a surface. In the last several decades, that frustration has begun to abate with numerous techniques providing clues to interactions and reactions at surfaces. Often these techniques require considerable prior knowledge. Complex mixtures on irregular or soft surfaces-complex interfaces-thus represent the last frontier. Two optical techniques: sum frequency generation (SFG) and second harmonic generation (SHG) are beginning to lift the veil on complex interfaces. Of these techniques, SFG with one excitation in the infrared has the potential to provide exquisite molecular- and moiety-specific vibrational data. This Perspective is intended both to aid newcomers in gaining traction in this field and to demonstrate the impact of high-phase resolution. It starts with a basic description of light-induced surface polarization that is at the heart of SFG. The sum frequency is generated when the input fields are sufficiently intense that the interaction is nonlinear. This nonlinearity represents a challenge for disentangling data to reveal the molecular-level picture. Three, high-phase-resolution methods that reveal interactions at the surface are described.
(2023 Published under an exclusive license by the AVS.)
(2023 Published under an exclusive license by the AVS.)