The structures of expanded liquid alkali metals, Na. K, Rb and Cs, along the Liquid-vapour coexistence curve are investigated theoretically by employing the integral equation method in the modified hypernerted-chain (hIHNC) approximation and the molecular dynamics (m) simulation. Excellent agreement is obtained between the MHNC and the MD results, which also agree well with the experimental results. It is shown from lhese systematic investigations that the characteristic features of the density dependence of the structure alongthe liquid-vapour coexistence curve observed for expanded liquid Rb (Franz er01 1980) andCs (Winterelal1987) arecommon featuresforexpanded liquidalkali metals.

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The structure of physalin P, a constituent of Physalis alkekengi var. francheti, was determined to be 5α-hydroxy-6,7-didehydro-5,6-dihydroneophysalin B by spectroscopic study and chemical correlation with a known compound.

We propose a new choice of the reference bridge functions to be employed in the modified hypemetted-chain (MHNC) approximation for determining the structure of a liquid alloy. ?be reference system we choose is the one interacting with the repulsive part of the interatomic potentials. The new scheme is applied to a liquid Na+s&.r alloy and it is shown that the calculated radial distribution functions are in excellent agreement with those of the molecular dynamics simulation. The results are also compared with those of the HNC and PY approximations as well as those of the m C scheme in which the bridge functions of the additive hard-sphere mixture are used.

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