Atomic Physics and Related Subjects.: Communications to Nature.: Unimolecular Films

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THE changes of state occurring in unimolecular films were the subject of a recent investigation (Lyons and Rideal, Proc. Roy. Soc., 124, A, 322; 1929). It was concluded, following Müller (Proc. Roy. Soc., 114, A, 542; 1927), that the molecules in the film were generally tilted. The suggestion was made that in the solid films of long chain substances the tilt of the molecules and therefore their areas were determined by the interlocking of zigzag chains. Since these views have recently been criticised (Adam, Proc. Roy. Soc., 126, A, 526; 1930), owing partly to a misunderstanding, a recapitulation of them and the evidence in their favour seems desirable.

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