Second-harmonic generation in monolayers of hemicyanine dyes at the air/water interface: Observation of chemical degradation
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Abstract
In situ studies of second-harmonic generation (SHG) in monolayers of pure hemicyanine dyes and their mixtures with arachidic acid at the air/water interface were performed. The studies revealed an unexpected chemical instability of the hemicyanine dyes involving a cleavage of the stilbene double bond when deposited onto the water surface. This reaction occurred especially rapidly in the presence of the arachidic acid. Dilution with arachidic acid did not lead to a significant enhancement of the harmonic intensity.
Key words
L-B film second harmonic generation hemicyanine dyes chemical stabilityPreview
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