Absorption spectroscopy at liquid interfaces by resonant surface second harmonic generation

Nancy E. Levinger; Kyle Y. Kung; Bradley M. Luther; Dale M. Willard

doi:10.1117/12.221495

25 September 1995 Absorption spectroscopy at liquid interfaces by resonant surface second harmonic generation

Nancy E. Levinger, Kyle Y. Kung, Bradley M. Luther, Dale M. Willard

Proceedings Volume 2547, Laser Techniques for Surface Science II; (1995) https://doi.org/10.1117/12.221495
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

We have measured the absorption spectrum of the laser dye IR125 (also known as indocyanine green) at the water/air interface using resonant enhanced surface second harmonic generation. The spectra of the dye molecules at the interface are extremely sensitive to the bulk concentration. All the surface spectra reflect aggregation of the dye at the interface, even at the smallest concentrations detectable, below 1 (mu) M. Resonant enhanced second harmonic generation appears to be a good technique for measuring spectra at liquid interfaces.

Citation Download Citation

Nancy E. Levinger, Kyle Y. Kung, Bradley M. Luther, and Dale M. Willard "Absorption spectroscopy at liquid interfaces by resonant surface second harmonic generation", Proc. SPIE 2547, Laser Techniques for Surface Science II, (25 September 1995); https://doi.org/10.1117/12.221495

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