The divergence of the correlations gives as the signal of something happens in the system in low density . l is the linear dimension of neutral clusters in the ionic system . the lower density with the larger l means the forming of larger neutral clusters 而其中lebowitz长度乙表示系统中离子所形成中性团的大小，久的发散表明了在离子液体系统中，随着密度越来越小，系统中会形成很多中性团，而且这些中性团也是越来越大的。
