account for the large magnitude of the acoustic signal seen in the cvlindrical exci-" tation geometry, the audible sound, and the failure of both of these signals to disappear at low temuerature. T h e reaction of carbon with water takes place at temperatures o n the order of hundreds of degrees Celsius;

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Floating monolayers as well as Langmuir-Blodgett (LB) films of poly(isocyanide)s containing NLO-active side chains appear to be capable of generating second-harmonic light. Spin-coated films and cast films of these polymers do not shown this behavior. These results indicate that the NLO activity of the LB films originates from the orientation of the side chains obtained at the air-water interface. In the case of poly(isocyanide)s with relatively hydrophobic side chains the second-harmonic intensities generated from the LB films are small, probably because the films are of the Y-type. Poly(isocyanide)s with more hydrophilic side chains form LB films which are Z-type. These films show stable secondharmonic generation without the need of poling with high electrical fields at high temperatures.