X-ray diffraction studies of organic monolayers on the surface of water

P. Dutta*, J. B. Peng, B. Lin, J. B. Ketterson, M. Prakash, P. Georgopoulos, S. Ehrlich

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

222 Scopus citations


We have used synchrotron radiation to study organic monolayers on water ("Langmuir films"). At high monolayer pressures, lead stearate [Pb(C17H35COO)2] shows a powder peak at 1.60 -1, implying an area per unit cell of 17.8 2 if the lattice is triangular. The correlation length is about 250. Lignoceric acid (C23H47COOH) shows a similar peak even though no heavy ions are attached. When the pressure is reduced, the peak in lead stearate does not observably move or broaden; below the "knee" in the isotherm, however, the peak height decreases slowly with increasing area, implying a first-order melting transition.

Original languageEnglish (US)
Pages (from-to)2228-2231
Number of pages4
JournalPhysical review letters
Issue number21
StatePublished - 1987

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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