  We present a general expression for the probability distribution function of
electric field in a plasma cloud formed by the impact of a laser pulse on a gas
or a solid body. We also present the results of numerical calculation of this
function for the case of non-interacting particles depending on the plasma
cloud size. It takes into account the ionic microfield and the macrofield
arising from the charge imbalance. As the charge imbalance increases, the
effect of a sharp increase in the distribution function for large field values
is observed. Good agreement between the calculation of the shift of the
spectral line and the experiment is obtained. The results obtained are of
crucial importance for diagnosing plasma in various applications.
