Structure analysis of liquid Rb and Cs

The observed correlation functions $g\left(r\right)\mathrm{}$ on liquid Rb and Cs have been compared with theoretical correlation functions which were calculated by means of three-dimensional convolution polynoms. These are given in terms of paracrystalline distorted body-centered tetragonal lattices with $\frac{c}{a}=1.23\mathrm{}$. The lattice types of fcc and bcc can be excluded. The present method provides detailed statistical information about the short-range atomic arrangement in the liquid state. From the macroscopic density of the liquids and the nearest-neighbor average distance it can be concluded that about 4-7% of the atoms lie on interstices.