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Proceedings Paper

Absorption spectroscopy at liquid interfaces by resonant surface second harmonic generation
Author(s): Nancy E. Levinger; Kyle Y. Kung; Bradley M. Luther; Dale M. Willard
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Paper 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.

Paper Details

Date Published: 25 September 1995
PDF: 11 pages
Proc. SPIE 2547, Laser Techniques for Surface Science II, (25 September 1995); doi: 10.1117/12.221495
Show Author Affiliations
Nancy E. Levinger, Colorado State Univ. (United States)
Kyle Y. Kung, Colorado State Univ. (United States)
Bradley M. Luther, Colorado State Univ. (United States)
Dale M. Willard, Colorado State Univ. (United States)

Published in SPIE Proceedings Vol. 2547:
Laser Techniques for Surface Science II
Janice M. Hicks; Wilson Ho; Hai-Lung Dai, Editor(s)

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