Second Harmonic Generation from Oxazine Dyes at the Air/Water Interface
β Scribed by Steinhurst, Daniel A.; Owrutsky, Jeffrey C.
- Book ID
- 111980822
- Publisher
- American Chemical Society
- Year
- 2001
- Tongue
- English
- Weight
- 212 KB
- Volume
- 105
- Category
- Article
- ISSN
- 0022-3654
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π SIMILAR VOLUMES
We have used second harmonic generation to directly observe chemical changes in a lipid monolayer. We observed that pK, of phexadecyl aniline at the air/water interface is 3.6& 0.2 versus 5.3 fO.l in the bulk. This fiftyfold increase in acidity is due to the higher free energy of a charged species a
The second harmonic generation from charged monolayers at air/water interfaces is shown to be linearly related to the interface electric potential. This dependence is due to the polarization of water molecules in the electrostatic field of the charged monolayer. The observed linear dependence of the