Study of Transition Probability of Low States of Alkali Metal Atoms with WBEPM Theory

In this paper, a theory, called Weakest Bound Electron Potential Model Theory, is employed to study the transition probability of low states of Na, K, Rb and Cs. The parameters are determined by solving the coupled equations: concerning energy ε and the radial expectation value < r > nl of the weakest bound electron. Some transition probabilities of alkali metal atoms are given to show the reliability of the present method. The more accurate the < r > nl and energy ε , the better the calculated results of the transition probabilities.