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Structure of a Langmuir Film Based on the Construction of a System Response Function for the Analysis of Second Harmonic Signals

✍ Scribed by Garland, N. L.; Lambrakos, S. G.; Barger, W. R.; Trzaskoma-Paulette, P. P.

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
460 KB
Volume
25
Category
Article
ISSN
0142-2421

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✦ Synopsis

Optical second harmonic generation is used to investigate the characteristics of a Langmuir Ðlm of hematoporphyrin IX dimethyl ester on water. Interfacial molecular orientation is determined by the construction of a system response function based on general and consistent assumptions concerning the distribution of second-order non-linear hyperpolarizabilities and the second harmonic intensity variation for compressed and expanded versions of the Ðlm. Two dominant average hyperpolarizability axes are observed for the individual molecules making up the Ðlm. Further, it is found that the molecules tend to align towards the vertical as the Ðlm is compressed from the maximum mean molecular area of 130 to the minimum mean molecular area of 70

The molecular tilt angle A A 2. varies from 44Ä under maximum compression to 71Ä under full expansion. These results show good quantitative agreement with previous investigations of Langmuir Ðlms of similar molecules.

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